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Document and Entity Information - USD ($) $ in Thousands	12 Months Ended
Document and Entity Information - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 27, 2018	Jun. 30, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	Cyclacel Pharmaceuticals, Inc.
Entity Central Index Key	0001130166
Trading Symbol	cycc
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding		11,997,447
Entity Public Float			$ 12,719,813
Document Type	10-K
Document Period End Date	Dec. 31, 2017
Amendment Flag	false
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 23,910	$ 16,520
Prepaid expenses and other current assets	2,064	3,097
Total current assets	25,974	19,617
Property and equipment, net	29	45
Total assets	26,003	19,662
Current liabilities:
Accounts payable	1,558	2,497
Accrued and other current liabilities	2,555	2,762
Total current liabilities	4,113	5,259
Other liabilities	124	130
Total liabilities	4,237	5,389
Commitments and contingencies (Note 9)
Stockholders' equity:
Preferred stock, value
Common stock, $0.001 par value; 100,000,000 shares authorized at December 31, 2016 and December 31, 2017; 4,256,829 and 11,997,447 shares issued and outstanding at December 31, 2016 and December 31, 2017, respectively.	12	4
Additional paid-in capital	365,057	350,051
Accumulated other comprehensive loss	(794)	(743)
Accumulated deficit	(342,509)	(335,039)
Total stockholders' equity	21,766	14,273
Total liabilities and stockholders' equity	26,003	19,662
Series A convertible preferred stock
Stockholders' equity:
Preferred stock, value	0	0
6% Convertible Exchangeable preferred stock
Stockholders' equity:
Preferred stock, value	$ 0	$ 0

CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares	Dec. 31, 2017	Dec. 31, 2016
CONSOLIDATED BALANCE SHEETS
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	11,997,447	4,256,829
Common stock, shares outstanding	11,997,447	4,256,829

CONSOLIDATED BALANCE SHEETS (Parentheticals 1) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
6% Convertible Exchangeable preferred stock
Preferred stock, shares issued	335,273	335,273
Preferred stock, shares outstanding	335,273	335,273
Preferred stock, liquidation preference value (in dollars)	$ 4,006,512	$ 4,006,512
Series A convertible preferred stock
Preferred stock, shares issued	264	0
Preferred stock, shares outstanding	264	0

CONSOLIDATED STATEMENTS OF OPERATIONS (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Grant revenue		$ 843
Total revenues	$ 0	843
Operating expenses:
Research and development	4,237	9,477
General and administrative	5,254	5,516
Total operating expenses	9,491	14,993
Operating loss	(9,491)	(14,150)
Other income (expense):
Foreign exchange gains (losses)	(39)	273
Interest income	118	37
Other income, net	949	66
Total other income (expense), net	1,028	376
Loss from continuing operations before taxes	(8,463)	(13,774)
Income tax benefit	993	1,983
Net loss	(7,470)	(11,791)
Dividend on convertible exchangeable preferred shares	(201)	(200)
Beneficial conversion feature of Series A convertible stock	(3,638)	0
Conversion of Series A convertible preferred stock	(3,537)	0
Net loss applicable to common shareholders	$ (14,846)	$ (11,991)
Basic and diluted earnings per common share:
Net loss per share - basic and diluted	$ (1.95)	$ (3.50)
Weighted average common shares outstanding (in shares)	7,631,152	3,424,976

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS
Net loss	$ (7,470)	$ (11,791)
Translation adjustment	(14,687)	27,204
Unrealized foreign exchange gain (loss) on intercompany loans	14,636	(27,351)
Comprehensive loss	$ (7,521)	$ (11,938)

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Total
Balance at Dec. 31, 2015		$ 3	$ 342,587	$ (596)	$ (323,159)	$ 18,835
Balance (in shares) at Dec. 31, 2015	335,273	2,965,208
Increase (Decrease) in Stockholders' Equity
Issue of common stock on At Market Issuance sales agreement		$ 1	6,793			6,794
Issue of common stock on At Market Issuance sales agreement (in shares)		1,291,621
Stock-based compensation			782			782
Preferred stock dividends			(200)			(200)
Unrealized foreign exchange on intercompany loans				(27,351)		(27,351)
Translation adjustment				27,204		27,204
Loss for the period					(11,791)	(11,791)
Cumulative effect of change in Accounting Principle for ASU 2016-09 at Dec. 31, 2016			89		(89)
Balance at Dec. 31, 2016		$ 4	350,051	(743)	(335,039)	14,273
Balance (in shares) at Dec. 31, 2016	335,273	4,256,829
Increase (Decrease) in Stockholders' Equity
Issue of common stock, preferred stock and associated warrants on underwritten offering, net of expenses		$ 3	13,681			13,684
Issue of common stock, preferred stock and associated warrants on underwritten offering, net of expenses (in shares)	8,872	3,154,000
Series A Preferred stock conversions		$ 4	(4)
Series A Preferred stock conversions (in shares)	(8,608)	4,304,000
Warrant exercise			199			199
Warrant exercise (in shares)		99,500
Issue of common stock on At Market Issuance sales agreement		$ 1	1,065			1,066
Issue of common stock on At Market Issuance sales agreement (in shares)		183,118
Stock-based compensation			266			266
Preferred stock dividends			(201)			(201)
Unrealized foreign exchange on intercompany loans				14,636		14,636
Translation adjustment				(14,687)		(14,687)
Loss for the period					(7,470)	(7,470)
Balance at Dec. 31, 2017		$ 12	$ 365,057	$ (794)	$ (342,509)	$ 21,766
Balance (in shares) at Dec. 31, 2017	335,537	11,997,447

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net loss	$ (7,470)	$ (11,791)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	32	133
Gain on disposal of property and equipment		(12)
Stock-based compensation expense	266	782
Changes in operating assets and liabilities:
Prepaid expenses and other assets	1,232	439
Accounts payable and other current liabilities	(1,540)	370
Net cash used in operating activities	(7,480)	(10,079)
Cash flows from investing activities:
Purchases of property and equipment	(13)	(3)
Proceeds from sale of property and equipment		12
Net cash provided by (used in) investing activities	(13)	9
Cash flows from financing activities:
Proceeds from issuance of equity securities, net of issuance costs	14,749	6,794
Proceeds from the exercise of stock options and warrants, net of issuance costs	200
Payment of preferred stock dividend	(201)	(200)
Net cash provided by financing activities	14,748	6,594
Effect of exchange rate changes on cash and cash equivalents	135	(444)
Net decrease in cash and cash equivalents	7,390	(3,920)
Cash and cash equivalents at beginning of period	16,520	20,440
Cash and cash equivalents at end of period	23,910	16,520
Cash received during the period for:
Interest	118	38
Taxes	1,815	1,965
Non cash financing activities:
Accrual of preferred stock dividends	$ 50	$ 50

Organization of the Company and Basis of Presentation	12 Months Ended
Organization of the Company and Basis of Presentation	Dec. 31, 2017
Organization of the Company
Organization of the Company and Basis of Presentation	1. Organization of the Company and Basis of Presentation Cyclacel Pharmaceuticals Inc., (“Cyclacel” or “the Company”) is a clinical-stage biopharmaceutical company using cell cycle, transcriptional regulation and DNA damage response biology to develop innovative, targeted medicines for cancer and other proliferative diseases. Cyclacel’s transcriptional regulation program is evaluating CYC065, a CDK inhibitor, in patients with advanced cancers. The DNA damage response program is evaluating a sequential regimen of sapacitabine and seliciclib, a CDK inhibitor, in patients with BRCA positive, advanced solid cancers. Cyclacel is analyzing stratified and exploratory subgroups from a Phase 3 study of sapacitabine in elderly patients with AML. Cyclacel’s strategy is to build a diversified biopharmaceutical business focused in hematology and oncology based on a pipeline of novel drug candidates. As of December 31, 2017, substantially all efforts of the Company to date have been devoted to performing research and development, conducting clinical trials, developing and acquiring intellectual property, raising capital and recruiting and training personnel. The Company is subject to risks and uncertainties common to early-stage companies in the biopharmaceutical industry, including, but not limited to, drug candidates developed by the Company typically will require approvals or clearances from the FDA, EMA or other similar regulatory agencies in other countries prior to commercial sales. There can be no assurance that the Company’s drug candidates will receive any of the required approvals or clearances. If the Company was denied approval or clearance or such approval was delayed, or is unable to obtain the necessary financing to complete development and approval, there will be a material adverse impact on the Company’s financial condition and results of operations. The Company has relied upon government grants to fund its earlier stage programs and does not expect to be able to continue to be successful in obtaining government grants to fund the Company’s research and development expenditure. Through December 31, 2017, the Company has funded all of its operations and capital expenditures with proceeds from the issuance of public equity securities, private placements of securities, government grants, research and development tax credits, interest on investments, product revenue and licensing revenue. The Company has incurred recurring losses since its inception, including net losses of $11.8 million and $7.5 million for the years ended December 31, 2016 and 2017, respectively. As of December 31, 2017, the Company had an accumulated deficit of $342.5 million. The Company expects to continue to generate operating losses for the foreseeable future due to, among other things, costs related to the clinical development of its drug candidates, its preclinical programs and its administrative organization. Going Concern Management considers that there are no conditions or events, in the aggregate, that raise substantial doubt about the entity’s ability to continue as a going concern for a period of at least one year from the date the financial statements are issued. The Company expects that its cash of $23.9 million as of December 31, 2017 will be sufficient to fund its operating expenses and capital expenditure requirements through to the end of 2019. This evaluation is based on relevant conditions and events that are known and reasonably knowable at the date that the financial statements are issued, including: a. The Company’s current financial condition, including its liquidity sources b. The Company’s conditional and unconditional obligations due or anticipated within one year c. The funds necessary to maintain the Company’s operations considering its current financial condition, obligations, and other expected cash flows, and d. Other conditions and events, when considered in conjunction with the above that may adversely affect the Company’s ability to meet its obligations. The future viability of the Company beyond 2019 is dependent on its ability to raise additional capital to finance its operations. The Company will need to raise substantial additional capital to pursue the transcriptional regulation program, evaluating CYC065, a CDK inhibitor, in patients with advanced cancers or the DNA damage response program, evaluating a sequential regimen of sapacitabine and seliciclib, a CDK inhibitor, in patients with BRCA positive, advanced solid cancers Additional funding may not be available to the Company on favorable terms, or at all. If the Company is unable to obtain additional funds, it will need to reduce operating expenses, enter into a collaboration or other similar arrangement with respect to development and/or commercialization rights to sapacitabine or its CDK inhibitors, if available, or be forced to delay or reduce the scope of its CDK inhibitors and sapacitabine development programs, including any potential regulatory filings related to the SEAMLESS study, and/or limit or cease its operations. The Company’s inability to raise capital as and when needed could have a negative impact on its financial condition and ability to pursue its business strategies. Reverse Stock Split On May 27, 2016, the Company completed a one-for-twelve reverse stock split (the “Reverse Stock Split”), which reduced the number of shares of the Company’s common stock that were issued and outstanding immediately prior to the effectiveness of the Reverse Stock Split. The number of shares of the Company’s authorized common stock was not affected by the Reverse Stock Split and the par value of Cyclacel’s common stock remained unchanged at $0.001 per share. The Reverse Stock Split reduced the number of shares of the Company’s common stock that were outstanding at May 27, 2016 from 36,075,730 to 3,006,311 after the cancellation of fractional shares. No fractional shares were issued in connection with the Reverse Stock Split. Stockholders who otherwise held fractional shares of the Company’s common stock as a result of the Reverse Stock Split received a cash payment in lieu of such fractional shares. All amounts related to number of shares and per share amounts have been retroactively restated in these consolidated financial statements. Basis of Presentation The accompanying consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and include the financial statements of Cyclacel Pharmaceuticals, Inc. and all of the Company’s wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated. Certain amounts in the prior year’s financial statements have been reclassified to conform to the current year’s presentation.

Summary of Significant Accounting Policies	12 Months Ended
Summary of Significant Accounting Policies	Dec. 31, 2017
Summary of Significant Accounting Policies
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Use of Estimates The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities and related disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Critical estimates include inputs used to determine clinical trial accruals, stock-based compensation expense and the recognition of revenue. Cyclacel reviews its estimates on an ongoing basis. The estimates are based on historical experience and on various other assumptions that the Company believes to be reasonable under the circumstances. Actual results may differ from these estimates. Cyclacel believes the judgments and estimates required by the following accounting policies to be significant in the preparation of the Company’s consolidated financial statements. Foreign Currency and Currency Translation Transactions that are denominated in a foreign currency are remeasured into the functional currency at the current exchange rate on the date of the transaction. Any foreign currency-denominated monetary assets and liabilities are subsequently remeasured at current exchange rates, with gains or losses recognized as foreign exchange (losses) gains in the statement of operations. The assets and liabilities of the Company’s international subsidiary are translated from its functional currency into United States dollars at exchange rates prevailing at the balance sheet date. Average rates of exchange during the period are used to translate the statement of operations, while historical rates of exchange are used to translate any equity transactions. Translation adjustments arising on consolidation due to differences between average rates and balance sheet rates, as well as unrealized foreign exchange gains or losses arising from translation of intercompany loans that are of a long-term-investment nature, are recorded in other comprehensive loss. Cash and Cash Equivalents Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash and cash equivalents. The Company considers all highly liquid investments with an original maturity of three months or less at the time of initial purchase to be cash equivalents. The objectives of the Company’s cash management policy are to safeguard and preserve funds, to maintain liquidity sufficient to meet Cyclacel’s cash flow requirements and to attain a market rate of return. The Company deposits its cash in financial institutions that it believes have high credit quality and has not experienced any losses on such accounts and does not believe it is exposed to any significant credit risk on cash and cash equivalents. The Company’s cash and cash equivalents balance at December 31, 2017 was $23.9 million and it maintains its cash accounts in several entities both within the United States and the United Kingdom. The total cash balances for amounts held in the United States are insured by the Federal Deposit Insurance Corporation (“FDIC”) up to $250,000 per account. The Company has cash balances exceeding the balance insured by the FDIC that totaled approximately $23.0 million at December 31, 2017. The total cash balances for amounts held in the United Kingdom are insured by the UK Government Financial Services Compensation Scheme (“FSCS”) up to £75,000 per account. The Company has cash balances exceeding the balance insured by the FSCS that totaled approximately $0.5 million at December 31, 2017. Property and Equipment The components of property and equipment are stated at cost and depreciated on a straight-line basis over the estimated useful lives of the related assets, which are generally three to five years. Amortization of leasehold improvements is performed using the straight-line method over the shorter of the remaining lease term or the estimated useful life of the related assets, currently between five and fifteen years. Upon sale or retirement of assets, the costs and related accumulated depreciation and amortization are removed from the balance sheet and the resulting gain or loss on sale is reflected as a component of operating income or loss. Expenditures for maintenance and repairs are charged to operating expenses as incurred. Impairment of Long-lived Assets The Company reviews property and equipment for impairment whenever events or changes in business circumstances indicate that the carrying amount of the assets may not be fully recoverable. The Company assesses the recoverability of the potentially affected long-lived assets by determining whether the carrying value of such assets can be recovered through undiscounted future operating cash flows. Impairment, if any, is measured as the amount by which the carrying amount of a long-lived asset (or asset group) exceeds its fair value. Fair Value of Financial Instruments Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. Assets and liabilities measured at fair value are classified and disclosed in one of the following three levels of the fair value hierarchy, of which the first two are considered observable and the last is considered unobservable: • Level 1 — Quoted prices in active markets for identical assets or liabilities. • Level 2 — Observable inputs (other than Level 1 quoted prices), such as quoted prices in active markets for similar assets or liabilities, quoted prices in markets that are not active for identical or similar assets or liabilities, or other inputs that are observable or can be corroborated by observable market data. • Level 3 — Unobservable inputs that are supported by little or no market activity that are significant to determining the fair value of the assets or liabilities, including pricing models, discounted cash flow methodologies and similar techniques. The carrying values of cash and cash equivalents, other receivables, accounts payable and accrued expenses approximate their fair values due to the short-term nature of these assets and liabilities. Segments The Company is managed and operated as one business which is focused on using cell cycle, transcriptional regulation and DNA damage response biology to develop innovative, targeted medicines for cancer and other proliferative diseases. The entire business is managed by a single management team that reports to the Chief Executive Officer. The Company does not operate separate lines of business with respect to any of its products or product candidates and the Company does not prepare discrete financial information with respect to separate products or product candidates or by location. Accordingly, the Company views its business as one reportable operating segment with development operations in two geographic areas, namely the United States and the United Kingdom. Revenue Recognition Collaboration, supply and licensing agreements Consideration received is allocated to each of the separable elements in an arrangement using the relative selling price method. An element is separable if it has value to the customer on a stand-alone basis. The selling price used for each separable element will be based on vendor-specific objective evidence (“VSOE”) if available, third party evidence if VSOE is not available, or estimated selling price if neither VSOE nor third party evidence is available. The best estimate of the selling price is determined after considering all reasonably available information, including market data and conditions, entity-specific factors such as the cost structure of the deliverable and internal profit and pricing objectives. Revenue is recognized for each separate element when persuasive evidence of an arrangement exists; delivery has occurred or services have been rendered; the fee is fixed or determinable; and collectability is reasonably assured. Milestone payments which are non-refundable, non-creditable and contingent on achieving clinical milestones are recognized as revenues either on achievement of such milestones if the milestones are considered substantive or over the period the Company has continuing performance obligations, if the milestones are not considered substantive. When determining if a milestone is substantive, the Company considers the following factors: • The degree of certainty in achieving the milestone • The frequency of milestone payments • The Company’s efforts, which result in achievement of the milestone • The amount of the milestone payment relative to the other deliverables and payment terms, and • Whether the milestone payment is related to future performance or deliverables The Company records as deferred revenue any amounts received prior to satisfying the revenue recognition criteria. Deferred revenue not expected to be recognized within the next twelve months is reported as non-current deferred revenue. The Company recognized $0 and $0.2 million deferred revenue as of December 31, 2016 and 2017 respectively. The deferred revenue reported as of December 31, 2017 relates to a prepayment received from ManRos Therapeutics SA for a development milestone that is not expected to be achieved until mid-2018 (see Note 3 for additional details). Royalty income is recognized when the licensee sells the underlying product. Grant revenue Grant revenues from government agencies and private research foundations are recognized as the related qualified research and development costs are incurred, up to the limit of the prior approval funding amounts. Grant revenues are not refundable. Other Income Other income is primarily related to royalty income received under a historical Asset Purchase Agreement for activities which are not part of the Company’s ongoing operations and activities. Research and Development Expenditures Research and development expenses consist primarily of costs associated with the Company’s product candidates, upfront fees, milestones, compensation and other expenses for research and development personnel, supplies and development materials, costs for consultants and related contract research, facility costs and depreciation. Expenditures relating to research and development are expensed as incurred. Clinical Trial Accounting Data management and monitoring of the Company’s clinical trials are performed with the assistance of contract research organizations (“CROs”) or clinical research associates (“CRAs”) in accordance with the Company’s standard operating procedures. Typically, CROs and CRAs bill monthly for services performed, and others bill based upon milestones achieved. For outstanding amounts, the Company accrues unbilled clinical trial expenses based on estimates of the level of services performed each period. Costs of setting up clinical trial sites for participation in the trials are recognized upon execution of the clinical trial agreement and expensed immediately as research and development expenses. Clinical trial costs related to patient enrollment are accrued as patients are entered into and progress through the trial. Patent Costs Patent prosecution costs are charged to general and administrative expenses as incurred as recoverability of such expenditure is uncertain. Leased Assets The costs of operating leases are charged to operations on a straight-line basis over the lease term. Operating leases relate primarily to the Company’s research and development facilities and corporate headquarters. Stock-based Compensation The Company measures all stock options and other stock-based awards granted to employees and directors based on the fair value on the date of the grant and recognizes compensation expense of those awards, over the requisite service period, which for the Company is the period between the grant date and the date the award vests or becomes exercisable. Most of the awards granted by the Company (and still outstanding) vest ratably over three or four years. However, certain awards granted to members of the Company’s Board of Directors vest in their entirety on the one-year anniversary following the date of grant. Generally, the Company issues stock options and restricted stock awards to employees with only service-based vesting conditions and records the expense for these awards using the straight-line method. However, in certain years, the Company granted restricted stock units to employees that were dependent upon the fulfillment of certain clinical and financial conditions. In such instances where the performance condition must be met for the award to vest, the company only recognizes expense in the period that the award becomes probable of vesting (See Note 11 — Stock-Based Compensation). The Company classifies stock-based compensation expense in its statement of operations in the same manner in which the award recipient’s payroll costs are classified. The Company accounts for forfeitures as they occur. The fair value of restricted stock and restricted stock units is determined based on the number of shares granted and the quoted price of the Company’s common stock on the date of grant. The determination of grant-date fair value for stock option awards is estimated using the Black-Scholes model, which includes variables such as the expected volatility of the Company’s share price, expected term of the award, interest rates, and dividend yields. The Company relies exclusively on its historical volatility as an input to the option pricing model as management believes that this rate will be representative of future volatility over the expected term of the options. The expected term assumption is estimated using past history of early exercise behavior and expectations about future behaviors. The weighted average risk-free interest rate represents interest rate for treasury constant maturities published by the Federal Reserve Board. If the term of available treasury constant maturity instruments is not equal to the expected term of an employee option, Cyclacel uses the weighted average of the two Federal Reserve securities closest to the expected term of the employee option. The expected dividend yield is based on the fact that the Company has never paid cash dividends on common stock and does not expect to pay any cash dividends in the foreseeable future. Income Taxes The Company accounts for income taxes using the liability method. Under this method, deferred tax assets and liabilities are determined based on the difference between the financial statement and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to affect taxable income. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts expected to be realized. The Company accounts for uncertainty in income taxes recognized in the financial statements by applying a two-step process to determine the amount of tax benefit to be recognized. First, the tax position must be evaluated to determine the likelihood that it will be sustained upon external examination by the taxing authorities. If the tax position is deemed more-likely-than-not to be sustained, the tax position is then assessed to determine the amount of benefit to recognize in the financial statements. The amount of the benefit that may be recognized is the largest amount that has a greater than 50% likelihood of being realized upon ultimate settlement. The provision for income taxes includes the effects of any resulting tax reserves, or unrecognized tax benefits, that are considered appropriate as well as the related net interest and penalties. Credit is taken in the accounting period for research and development tax credits, which will be claimed from H.M. Revenue & Customs (“HMRC”), the United Kingdom’s taxation and customs authority, in respect of qualifying research and development costs incurred in the same accounting period. Net Loss Per Common Share The Company calculates net loss per common share in accordance with ASC 260 “Earnings Per Share” (“ASC 260”). Basic and diluted net loss per common share was determined by dividing net loss applicable to common stockholders by the weighted average number of common shares outstanding during the period. In periods in which the Company reports a net loss attributable to common stockholders, diluted net loss per share attributable to common stockholders is the same as basic net loss per share attributable to common stockholders since dilutive common shares are not assumed to have been issued if their effect is anti-dilutive. The Company reported a net loss attributable to common stockholders for the years ended December 31, 2016 and 2017. Comprehensive Income (Loss) All components of comprehensive income (loss), including net income (loss), are reported in the financial statements in the period in which they are recognized. Comprehensive income (loss) is defined as the change in equity during a period from transactions and other events and circumstances from non-owner sources. Net income (loss) and other comprehensive income (loss), including foreign currency translation adjustments, are reported, net of any related tax effect, to arrive at comprehensive income (loss). No taxes were recorded on items of other comprehensive income (loss). There were no reclassifications out of other comprehensive income (loss) during the years ended December 31, 2016 and 2017. Recently Issued Accounting Pronouncements In July 2017, the FASB issued Accounting Standards Update (“ASU”) No. 2017-11, Accounting for Certain Financial Instruments with Down Round Features (“ASU 2017-11”), which simplifies the accounting for certain financial instruments with down-round features. A down round feature is a provision in a financial instrument that reduces the strike price of an issued financial instrument if the issuer sells shares of its stock for an amount less than the currently stated strike price of the issued financial instrument or issues an equity-linked financial instrument with a strike price below the currently stated strike price of the issued financial instrument. ASU 2017-11 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted, including adoption in an interim period. ASU 2017-11 should be adopted retrospectively for each prior reporting period presented or retrospectively as of the beginning of the year of adoption. The Company anticipates this standard will not have a material impact on its consolidated financial statements. In October 2016, the FASB issued ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfer of Assets Other than Inventory (“ASU 2016-16”), which requires the recognition of the income tax consequences of an intra-entity transfer of an asset, other than inventory, when the transfer occurs. The standard is effective for annual periods beginning after December 15, 2017, including interim periods within those fiscal years. This standard will not have a material impact on the company’s consolidated financial statements. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”), to address diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The standard is effective for annual periods beginning after December 15, 2017, including interim periods within those fiscal years. This standard will not have a material impact on the company’s consolidated financial statements. In February 2016, the FASB issued guidance on accounting for leases in ASU No, 2016-02. The guidance requires that lessees recognize a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term at the commencement date. The guidance is effective for fiscal years beginning after December 15, 2018. Early application is permitted. The guidance must be adopted on a modified retrospective transition approach for leases existing, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The Company is currently evaluating the impact of the guidance on the consolidated financial statements. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”), which supersedes existing revenue recognition guidance. The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those goods or services. The standard defines a five-step process to achieve this principle; (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when, or as, the Company satisfies a performance obligation. ASU 2014-09 also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts. The guidance is effective for annual periods beginning after December 15, 2017 and for interim periods within those fiscal years. ASU 2014-09 was amended by multiple accounting standards updates from 2014-2016. The Company anticipates this standard will not have a material impact on its consolidated financial statements. The Company currently believes the most significant impact relates to its accounting for revenues related to grants received from government agencies or nonprofit organizations. Under the new standard, the Company expects to report the inflows from the types of grants it typically receives in other income (or in some cases as a contra-expense). Historically, grants have been reported in revenue. As the grantor is not likely to be receiving a good or service in exchange for the payment, the grant cannot be reported in revenue under ASU 2014-09. The Company also expects to recognize revenue associated with contingent milestone-based payments at the time the contingent event is probable to be met, rather than when the milestone is achieved. However, given the limited number of potential milestones owed to Cyclacel, and the inherent risk involved in developing drugs, the timing of revenue recognition associated with contingent milestones is unlikely to be significantly impacted. ASU 2014-09 permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the modified retrospective method). The Company intends to use the modified retrospective method upon adoption of the new accounting standard, and does not anticipate recording a material adjustment to opening accumulated deficit as of the date of adoption.

Significant Contracts	12 Months Ended
Significant Contracts	Dec. 31, 2017
Significant Contracts Disclosure [Abstract]
Significant Contracts	3. Significant Contracts Distribution, Licensing and Research Agreements The Company has entered into licensing agreements with academic and research organizations. Under the terms of these agreements, the Company has received licenses to technology and patent applications. The Company is required to pay royalties on future sales of products employing the technology or falling under claims of patent applications. The most significant licensing agreement is with Daiichi Sankyo. Pursuant to the Daiichi Sankyo license under which the Company licenses certain patent rights for sapacitabine the Company is under an obligation to use reasonable endeavors to develop a product and obtain regulatory approval to sell a product and has agreed to pay Daiichi Sankyo an up-front fee, reimbursement for Daiichi Sankyo’s enumerated expenses, milestone payments and royalties on a country-by-country basis. The up-front fee, Phase 3 entry milestone, and certain past reimbursements have been paid. A further $10.0 million in aggregate milestone payments could be payable subject to achievement of all the specific contractual milestones which are primarily related to regulatory approval in various territories, and the Company’s decision to continue with these projects. Royalties are payable in each country for the term of patent protection in the country or for ten years following the first commercial sale of licensed products in the country, whichever is later. Royalties are payable on net sales. Net sales are defined as the gross amount invoiced by the Company or its affiliates or licensees, less discounts, credits, taxes, shipping and bad debt losses. The agreement extends from its commencement date to the date on which no further amounts are owed under it. If the Company wishes to appoint a third party to develop or commercialize a sapacitabine-based product in Japan, within certain limitations, Daiichi Sankyo must be notified and given a right of first refusal, with the right of first refusal ending sixty days after notification, to develop and/or commercialize in Japan. In general, the license may be terminated by the Company for technical, scientific, efficacy, safety, or commercial reasons on six months’ notice, or twelve months’ notice, if after a launch of a sapacitabine-based product, or by either party for material default. There were no milestones earned in 2016 or 2017. Collaboration, Supply and Licensing Agreements In June 2015, the Company entered into a collaboration, licensing and supply agreement with ManRos Therapeutics SA (“ManRos”), for the exclusive development and commercialization of the Company’s oral seliciclib capsules by ManRos as a treatment for cystic fibrosis (“CF”). Among other terms of the agreement, ManRos licensed rights to the Company’s proprietary clinical data to enable clinical development of seliciclib for CF indications. The agreement provides for supply of seliciclib investigational product for initial and later stage clinical trials of seliciclib in CF and technical assistance related to the Company’s know-how to facilitate these trials. The Company received an up-front payment in July 2015 and reached a development milestone in September 2015. The Company will receive further milestone payments and tiered royalties, if seliciclib is commercialized for the treatment of CF. The upfront and milestone payments have been allocated to the separate deliverables within the arrangement and recognized over the period in which the deliverables are met. The consideration allocated to the main deliverable — the transfer of the Company’s know-how — was determined based on its estimated standalone selling price, using a market approach that identified similar license deals for a Phase 1/2 asset. The Company reviewed various licensing transactions in the public domain in the CF area and similar stage of asset development. In the year ended December 31, 2016 and 2017, the Company recognized revenue of $0 and $0, respectively. In the fourth quarter of 2017, the Company received a $150,000 payment from ManRos in anticipation of ManRos achieving a clinical milestone in 2018. This payment has been recorded as deferred revenues on the balance sheet (part of other current liabilities) as the milestone was not achieved as of December 31, 2017.

Cash and Cash Equivalents

12 Months Ended

Dec. 31, 2017

Cash and Cash Equivalents

Cash and Cash Equivalents

4. Cash and Cash Equivalents

The following is a summary of cash and cash equivalents at December 31, 2016 and 2017 (in thousands):

	December 31,
	2016			2017
Cash		$	5,332		$	1,103
Investments with original maturity of less than three months at the time of purchase			11,188			22,807
Total cash and cash equivalents		$	16,520		$	23,910

Investments with original maturity of less than three months at time of purchase are made up of money market funds and commercial paper.

Fair Value of Financial Assets and Liabilities

12 Months Ended

Dec. 31, 2017

Fair Value

Fair Value of Financial Assets and Liabilities

5. Fair Value of Financial Assets and Liabilities

The following tables present information about the Company’s financial assets and liabilities measured at fair value on a recurring basis and indicate the level of the fair value hierarchy utilized to determine such fair values (in thousands):

	Fair Value Measurements as of December 31, 2016 Using:
	Level 1			Level 2			Level 3			Total
Assets:
Cash equivalents		$	11,188		$	—		$	—		$	11,188
Total Assets		$	11,188		$	—		$	—		$	11,188

	Fair Value Measurements as of December 31, 2017 Using:
	Level 1			Level 2			Level 3			Total
Assets:
Cash equivalents		$	22,807		$	—		$	—		$	22,807
Total Assets		$	22,807		$	—		$	—		$	22,807

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Prepaid Expenses and Other Current Assets

12 Months Ended

Dec. 31, 2017

Prepaid Expenses And Other Current Assets [Abstract]

Prepaid Expenses and Other Current Assets

6. Prepaid Expenses and Other Current Assets

The following is a summary of prepaid expenses and other current assets at December 31, 2016 and 2017 (in thousands):

	December 31,
	2016			2017
Research and development tax credit receivable		$	1,730		$	1,054
Prepayments			867			363
Delaware tax receivable			—			25
VAT receivable			327			409
Deposits			132			132
Other current assets			41			81
Prepaid expenses and other current assets		$	3,097		$	2,064

Property and Equipment

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment

Property and Equipment

7. Property and Equipment

Property and equipment consisted of the following at December 31, 2016 and 2017 (in thousands):

	Lives in years	December 31,
	Lives in years	2016			2017
Leasehold improvements	5 to 15		$	792		$	835
Research and laboratory equipment	3 to 5			4,438			4,854
Office equipment and furniture	3 to 5			1,157			1,236
				6,387			6,925
Less: accumulated depreciation and amortization				(6,342)			(6,896)
			$	45		$	29

Depreciation and amortization expense for property and equipment was $0.1 million and $32,000 for the years ended December 31, 2016 and 2017, respectively. During the year ended December 31, 2016, the Company sold fully depreciated assets for proceeds of approximately $12,000. The Company did not sell any property or equipment during the year ended December 31, 2017.

Accrued and Other Current Liabilities

12 Months Ended

Dec. 31, 2017

Accrued and Other Current Liabilities

Accrued and Other Current Liabilities

8. Accrued and Other Current Liabilities

Accrued and other current liabilities consisted of the following at December 31, 2016 and 2017 (in thousands):

	December 31,
	2016			2017
Accrued research and development		$	2,138		$	1,645
Accrued legal and professional fees			194			248
Other current liabilities			430			662
		$	2,762		$	2,555

Other current liabilities in 2017 include $150,000 deferred income in respect of payment received in advance of achieving a milestone under the ManRos agreement (see Note 3 — Significant Contracts).

Commitments and Contingencies

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies

Commitments and Contingencies

9. Commitments and Contingencies

General

Please refer to Note 3 — Significant Contracts for further discussion of certain of the Company’s commitments and contingencies.

Leases

In October 2000, the Company entered into a twenty-five year lease for its research and development facility in Dundee, Scotland. Rent expense, which includes lease payments related to the Company’s research and development facilities and corporate headquarters and other rent related expenses was $0.5 and $0.5 million for each of the years ended December 31, 2016 and 2017, respectively.

The following is a summary of the Company’s future contractual obligations and commitments relating to its facilities leases as at December 31, 2017 (in thousands):

	Operating Lease Obligation
2018		$	348
2019			344
2020			344
2021			344
2022			343
thereafter			956
Total future minimum lease obligations		$	2,679

Stockholders' Equity	12 Months Ended
Stockholders' Equity	Dec. 31, 2017
Stockholders' Equity
Stockholders' Equity	10. Stockholders’ Equity The Company has completed the following equity issuances during the periods presented in the consolidated financial statements. July 2017 Underwritten Public Offering On July 21, 2017, the Company issued (i) 3,154,000 Class A Units for $2 per unit, each consisting of one share of the Company’s common stock, and a warrant to purchase one share of common stock (the “Class A Warrants”), and (ii) 8,872 Class B Units, each consisting of one share of the Company’s Series A Convertible Preferred Stock, par value $0.001 per share (the “Series A Preferred Stock”), convertible into 500 shares of Common Stock at the initial conversion price, and a warrant to purchase a number of shares of common stock equal to $1,000.00 divided by the conversion price (the “Class B Warrants”) for $1,000 per unit. The net proceeds to the Company after the underwriters’ exercise in full of the over-allotment option were approximately $13,700,000, after deducting underwriting discounts, commissions and other estimated offering expenses. The Class A Units and Class B Units have no stand-alone rights and the shares of common stock, Series A Preferred Stock and the Class A and Class B Warrants comprising those units were immediately separable. The common stock, Class A Warrants and Class B Warrants (together the “Warrants”) and Series A Preferred Stock are freestanding financial instruments. The Warrants are classified within equity (as a component of additional paid-in capital) in the consolidated balance sheet and are not remeasured on a recurring basis. The Series A Preferred Stock is classified within permanent equity in the consolidated balance sheet. The proceeds from the Class A Units were allocated to common stock and Class A Warrants on a relative fair value basis. Similarly, the proceeds from the Class B Units were allocated to the Series A Preferred Stock and the Class B Warrants based on their relative fair values. Following the allocation of the offering proceeds associated with the Class B units, the Company determined that the Series A Preferred Stock had a beneficial conversion feature with an aggregate intrinsic value of approximately $3,638,000. As the Series A Preferred Stock contained no stated redemption date, and the conversion feature could be exercised at any time, the discount associated with the beneficial conversion feature was immediately charged against additional paid-in capital and treated as a deemed dividend for both financial reporting and earnings per share purposes. June 2016 At Market Issuance On June 23, 2016, the Company entered into an At Market Issuance Sales Agreement (the “FBR Sales Agreement”) with FBR Capital Markets & Co. (“FBR”), under which the Company was authorized to issue and sell shares of its common stock, from time to time, through FBR, acting as its sales agent. Under the FBR Sales Agreement, FBR was authorized to sell such shares of common stock by any method that is deemed to be an “at the market offering”. The Company was not obligated to make any sales of common stock under the FBR Sales Agreement, and the Company was required to pay FBR a commission of 3.0% of the gross proceeds of the sale of any shares of common stock sold through FBR. During the year ended December 31, 2017, the Company sold 183,118 shares of common stock under the FBR Sales agreement for net proceeds of approximately $1.1 million, and the FBR Sales Agreement terminated automatically by its terms. July 2015 Controlled Equity Offering SM On July 10, 2015, the Company entered into a Controlled Equity OfferingSM Sales Agreement with Cantor Fitzgerald (the “Cantor Sales Agreement”) under which the Company may, from time to time, sell shares of its common stock having an aggregate offering price of up to $8.35 million through Cantor Fitzgerald. Under the Cantor Sales Agreement, Cantor Fitzgerald may sell shares of Cyclacel common stock by methods deemed to be an “at-the-market” offering as defined in Rule 415 promulgated under the Securities Act of 1933, as amended (the “Securities Act”). The Company will pay Cantor Fitzgerald a commission of up to 3.0% of the gross sales price per share sold. Cyclacel is not obligated to make any sales under the Cantor Sales Agreement. Effective as of June 17, 2016, and prior to entering into the FBR Sales Agreement, the Company and Cantor agreed to terminate the Cantor Sales Agreement. The Company had issued an aggregate of 114,078 shares pursuant to the Cantor Sales Agreement of which 41,996 were issued during the year ended December 31, 2016 for net proceeds of approximately $0.2 million. The following is a description of the Company’s outstanding equity instruments. Warrants As of December 31, 2017, there were 7,490,500 warrants outstanding, each with an exercise price of $2.00. All such warrants were issued in connection with the July 2017 Underwritten Public Offering and are immediately exercisable. The Warrants expire in 2024. Subject to limited exceptions, a holder of warrants will not have the right to exercise any portion of its warrants if the holder (together with such holder’s affiliates, and any persons acting as a group together with such holder or any of such holder’s affiliates) would beneficially own a number of shares of common stock in excess of 4.99% (or, at the election of the purchaser, 9.99%) of the shares of our Common Stock then outstanding after giving effect to such exercise. The exercise price and the number of shares issuable upon exercise of the warrants is subject to appropriate adjustment in the event of recapitalization events, stock dividends, stock splits, stock combinations, reclassifications, reorganizations or similar events affecting the Company’s common stock. The warrant holders must pay the exercise price in cash upon exercise of the warrants, unless such warrant holders are utilizing the cashless exercise provision of the warrants. On the expiration date, unexercised warrants will automatically be exercised via the “cashless” exercise provision. Prior to the exercise of any warrants to purchase common stock, holders of the warrants will not have any of the rights of holders of the common stock purchasable upon exercise, including the right to vote, except as set forth therein. Warrants exercised during the year ended December 31, 2016 and 2017 were 0 and 99,500 respectively. Gross proceeds during the year for such exercises amounted to $199,000 with a weighted average exercise price of $2.00 per share. Series A Preferred Stock 8,872 shares of the Company’s Series A Preferred Stock were issued in the July 2017 Underwritten Public Offering. Each share of Series A Preferred Stock is convertible at any time at the option of the holder thereof, into a number of shares of common stock determined by dividing $1,000 by the initial conversion price of $2.00 per share, subject to a 4.99% blocker provision, or, upon election by a holder prior to the issuance of shares of Series A Preferred Stock, 9.99%, and is subject to adjustment for stock splits, stock dividends, distributions, subdivisions and combinations. During the year ended December 31, 2017, 8,608 shares of the Series A Preferred Stock were converted into 4,304,000 shares of common stock. As of December 31, 2017, 264 shares of the Series A Preferred Stock remain issued and outstanding. The 264 shares of Series A Preferred Stock issued and outstanding at December 31, 2017, are convertible into 132,000 shares of common stock. In the event of a liquidation, the holders of shares of the Series A Preferred Stock may participate on an as-converted-to-common-stock basis in any distribution of assets of the Company. The Company shall not pay any dividends on shares of common stock (other than dividends in the form of common stock) unless and until such time as dividends on each share of Series A Preferred Stock are paid on an as-converted basis. There is no restriction on the Company’s ability to repurchase shares of Series A Preferred Stock while there is any arrearage in the payment of dividends on such shares, and there are no sinking fund provisions applicable to the Series A Preferred Stock. Subject to certain conditions, at any time following the issuance of the Series A Preferred Stock, the Company has the right to cause each holder of the Series A Preferred Stock to convert all or part of such holder’s Series A Preferred Stock in the event that (i) the volume weighted average price of our common stock for 30 consecutive trading days (the “Measurement Period”) exceeds 300% of the initial conversion price of the Series A Preferred Stock (subject to adjustment for forward and reverse stock splits, recapitalizations, stock dividends and similar transactions), (ii) the daily trading volume on each Trading Day during such Measurement Period exceeds $500,000 per trading day and (iii) the holder is not in possession of any information that constitutes or might constitute, material non-public information which was provided by the Company. The right to cause each holder of the Series A Preferred Stock to convert all or part of such holder’s Series A Preferred Stock shall be exercised ratably among the holders of the then outstanding preferred stock. The Series A Preferred Stock has no maturity date, will carry the same dividend rights as the common stock, and with certain exceptions contains no voting rights. In the event of any liquidation or dissolution of the Company, the Series A Preferred Stock ranks senior to the common stock in the distribution of assets, to the extent legally available for distribution. 6% Convertible Exchangeable Preferred Stock As of December 31, 2017, there were 335,273 shares of the Company’s 6% Convertible Exchangeable (“Preferred Stock”) issued and outstanding at an issue price of $10.00 per share. Dividends on the Preferred Stock are cumulative from the date of original issuance at the annual rate of 6% of the liquidation preference of the Preferred Stock, payable quarterly on the first day of February, May, August and November, commencing February 1, 2005. Any dividends must be declared by the Company’s Board of Directors and must come from funds that are legally available for dividend payments. The Preferred Stock has a liquidation preference of $10.00 per share, plus accrued and unpaid dividends. The Company’s Board of Directors considers numerous factors in determining whether to declare the quarterly dividend pursuant to the Certificate of Designations governing the terms of the Company’s Preferred Stock, including the requisite financial analysis and determination of a surplus. Accrued and unpaid dividends in arrears on preferred stock were $0.7 million, or $1.95 per share, of preferred stock, as of December 31, 2016 and 2017. The Preferred Stock is convertible at the option of the holder at any time into the Company’s shares of common stock at a conversion rate of approximately 0.00507 shares of common stock for each share of Preferred Stock based on a price of $1,974. The Company has reserved 1,698 shares of common stock for issuance upon conversion of the remaining shares of Preferred Stock outstanding at December 31, 2016. The shares of previously-converted Preferred Stock have been retired, cancelled and restored to the status of authorized but unissued shares of preferred stock, subject to reissuance by the Board of Directors as shares of Preferred Stock of one or more series. The Company may automatically convert the Preferred Stock into common stock if the closing price of the Company’s common stock has exceeded $2,961, which is 150% of the conversion price of the Preferred Stock, for at least 20 trading days during any 30-day trading period, ending within five trading days prior to notice of automatic conversion. The Certificate of Designations governing the Preferred Stock provides that if the Company fails to pay dividends on its Preferred Stock for six quarterly periods, holders of Preferred Stock are entitled to nominate and elect two directors to the Company’s Board of Directors. This right accrued to the holders of Preferred Stock as of August 2, 2010 and two directors were nominated and elected at the annual meeting held on May 24, 2011. The Preferred Stock has no maturity date and no voting rights prior to conversion into common stock, except under limited circumstances. The Company may, at its option, redeem the Preferred Stock in whole or in part, out of funds legally available at the redemption price of $10.00 per share. The Preferred Stock is exchangeable, in whole but not in part, at the option of the Company on any dividend payment date beginning on November 1, 2005 (the “Exchange Date”) for the Company’s 6% Convertible Subordinated Debentures (“Debentures”) at the rate of $10.00 principal amount of Debentures for each share of Preferred Stock. The Debentures, if issued, will mature 25 years after the Exchange Date and have terms substantially similar to those of the Preferred Stock. No such exchanges have taken place as of December 31, 2017. For the year ended December 31, 2017, the company declared dividends of $0.15 per share quarterly on its Preferred Stock. These dividends were paid on May 1, August 1 and November 1, 2017, and February 1, 2018, respectively. Common Stock Exercise of Stock Options No stock options were exercised during the years ended December 31, 2016 and 2017.

Stock-Based Compensation

12 Months Ended

Dec. 31, 2017

Stock-Based Compensation Arrangements

Stock-Based Compensation

11. Stock-Based Compensation

Stock based compensation has been reported within the following expense line items on the consolidated statement of operations for the years ended 2016 and 2017, as shown in the following table (in thousands):

	Year Ended December 31, 2016			Year Ended December 31, 2017
Research and development		$	305		$	72
General and administrative			477			194
Stock-based compensation costs before income taxes		$	782		$	266

2015 Plan

On May 22, 2015, the Company’s stockholders approved the 2015 Equity Incentive Plan (the “2015 Plan”), under which Cyclacel may make equity incentive grants to its officers, employees, directors and consultants. The company has reserved 458,753 shares of the Company’s common stock under the 2015 Plan. The 2015 Plan replaces the 2006 Equity Incentive Plan (the “2006 Plan”), under which there were no remaining reserved shares to be granted. Stock option awards granted under the Company’s equity incentive plans have a maximum life of 10 years and generally vest over a one to four-year period from the date of grant.

During 2016, the Company granted 197,841 options to employees and directors with a grant date fair value of approximately $0.7 million. Of these options, 189,091 are performance based, which will vest upon the fulfilment of certain clinical conditions and will terminate if they have not vested by December 31, 2020. The Company determined that the satisfaction of the vesting criteria was not probable throughout 2016 and 2017 and, as a result, did not record any expense related to these awards for the years ended December 31, 2016 and 2017.

There were 170,853 options granted during the year ended December 31, 2017. Of these options, 158,853 are performance based, which will vest upon the fulfillment of certain clinical conditions. The Company determined that the satisfaction of one of the conditions was probable as of December 31, 2017, but that the other vesting criteria related to these awards were not probable as of December 31, 2017. As such, the Company recognized compensation cost for these grants under the expectation that 25% of these awards will vest.

The weighted average grant-date fair values of options granted during the years ended December 31, 2016 and 2017 were $3.66 and $1.59, respectively.

As of December 31, 2017, the total remaining unrecognized compensation cost related to the non-vested stock options with service conditions amounted to approximately $0.2 million, which will be amortized over the weighted-average remaining requisite service period of 0.9 years.

During the years ended December 31, 2016 and 2017, the Company did not settle any equity instruments with cash.

There were no stock option exercises during the years ended 2016 and 2017. No income tax benefits were recorded for the years ended December 31, 2016 and 2017 because the Company has accumulated net operating losses for tax purposes and is not likely to benefit from any deductions associated with exercises of granted option awards.

Outstanding Options

A summary of the share option activity and related information is as follows:

	Number of Options Outstanding		Weighted Average Exercise Price Per Share			Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value ($000s)
Options outstanding at December 31, 2015		206,298		$	72.60		8.09		$	—
Granted		197,841		$	4.68
Exercised		—
Cancelled/forfeited		(14,760)		$	396.83
Options outstanding at December 31, 2016		389,379		$	25.80		5.83		$	121
Granted		170,853		$	1.93
Exercised		—
Cancelled/forfeited		(24,615)		$	179.92
Options outstanding at December 31, 2017		535,617		$	11.10		8.23		$	—
Unvested at December 31, 2017		386,682		$	3.64		8.84		$	—
Vested and exercisable at December 31, 2017		148,755		$	30.49		6.65		$	—

The fair value of the stock options granted is calculated using the Black-Scholes option-pricing model using the following assumptions:

	Year ended December 31, 2016	Year ended December 31, 2017
Expected term (years)	5 – 6	6
Risk free interest rate	1.370% – 1.500%	1.890% – 2.265%
Volatility	98% – 104%	108%
Expected dividend yield over expected term	0.00%	0.00%
Resulting weighted average grant date fair value	$3.66	$1.59

Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2017
Employee Benefit Plans
Employee Benefit Plans	12. Employee Benefit Plans Pension Plan The Company operates a defined contribution group personal pension plan for all of its UK based employees. Company contributions to the plan totaled approximately $57,000 and $54,000 for the years ended December 31, 2016 and 2017, respectively. 401(k) Plan The 401(k) Plan provides for matching contributions by the Company in an amount equal to the lesser of 100% of the employee’s deferral or 6% of the U.S. employee’s qualifying compensation. The 401(k) Plan is intended to qualify under Section 401(k) of the Internal Revenue Code, so that contributions to the 401(k) Plan by employees or by the Company, and the investment earnings thereon, are not taxable to the employees until withdrawn. Company matching contributions are tax deductible by the Company when made. Company employees may elect to reduce their current compensation by up to the statutorily prescribed annual limit of $18,000 if under 50 years old and $24,000 if over 50 years old and to have those funds contributed to the 401(k) Plan. The Company made contributions of approximately $32,000 and $28,000 to the 401(k) Plan for the years ended December 31, 2016 and 2017, respectively.

Taxes

12 Months Ended

Dec. 31, 2017

Taxes

Taxes

13. Taxes

(Loss) income from continuing operations before taxes is comprised of the following components for the years ended December 31, 2016 and 2017 (in thousands):

	Year Ended December 31,
	2016			2017
Domestic		$	(2,011)		$	(127)
Foreign			(11,763)			(8,336)
Loss from continuing operations before taxes		$	(13,774)		$	(8,463)

The benefit (provision) for income taxes from continuing operations consists of the following (in thousands):

	Year Ended December 31,
	2016			2017
Current – domestic		$	—		$	—
Current – foreign			1,983			993
Current – total			1,983			993
Deferred – domestic			—			—
Income tax benefit		$	1,983		$	993

The Company has incurred a taxable loss in each of the operating periods since incorporation. The income tax credits of $2.0 million and $1.0 million for the years ended December 31, 2016 and 2017, respectively, represent UK research and development (“R&D”) tax credits for expenditures in the United Kingdom that are refundable.

A reconciliation of the (benefit) provision for income taxes from continuing operations with the amount computed by applying the statutory federal tax rate to loss from continuing operations before income taxes is as follows (in thousands):

	Year Ended December 31,
	2016			2017
Loss from continuing operations before taxes		$	(13,774)		$	(8,463)
Income tax expense computed at statutory federal tax rate			(4,683)			(2,877)
Disallowed expenses and non-taxable income			12			3
Loss surrendered to generate R&D credit			1,945			856
Additional research and development tax relief			(2,827)			(1,262)
Change in valuation allowance			2,029			(4,487)
Foreign items, including change in tax rates, and other			1,238			1,901
Change in US Tax Rate			—			4,112
Other foreign items			303			761
		$	(1,983)		$	(993)

On December 22, 2017, the United States enacted the Tax Cuts and Jobs Act (“Tax Act”), which made significant changes to U.S. federal income tax law. The Company expects that certain aspects of the Tax Act will positively impact the Company’s future after-tax earnings in the U.S., primarily due to the lower federal statutory tax rate. Set forth below is a discussion of certain provisions of the Tax Act and our preliminary assessment of the effect of such provisions on the Company’s results of operations, cash flows and consolidated financial statements.

The Tax Act will affect 2018 and forward, including but not limited to a reduction in the federal corporate rate from 35.0% to 21.0%, elimination of the corporate alternative minimum tax, a new limitation on the deductibility of certain executive compensation, limitations on net operating losses generated after December 31, 2017 and various other items. We do not expect these changes to have a material impact on our financial statements due to the accumulated net operating losses in the U.S.

The Tax Act provides for a one-time “deemed repatriation” of accumulated unrepatriated foreign earnings determined as of November 2, 2017, or December 31, 2017, whichever is greater. We do not expect to be subject to this provision due to the accumulated deficit in our foreign earnings for tax purposes. The Tax Act also created a new requirement that certain income earned by controlled foreign corporations must be included currently in the gross income of the U.S. shareholder under the Global Intangible Low-Taxed Income (GILTI) provision. We do not expect that any future foreign earnings will be subject to GILTI due to our US net operating losses.

In December 2017, the SEC staff issued Staff Accounting Bulletin No. 118 (“SAB 118”), which addresses how a company recognizes provisional amounts when a company does not have the necessary information available, prepared or analyzed (including computations) in reasonable detail to complete its accounting for the effect of the changes in the Act. SAB 118 provides for a measurement period that should not extend beyond one year from the Act enactment date for companies to complete the accounting under Accounting Standards Codification Topic 740, Income Taxes (“ASC 740”). In accordance with SAB 118, a company must reflect the income tax effects of those aspects of the Act for which the accounting under ASC 740 is complete. To the extent that a company’s accounting for certain income tax effects of the Tax Act is incomplete but it is able to determine a reasonable estimate, it must record a provisional estimate to be included in the financial statements. If a company cannot determine a provisional estimate to be included in the financial statements, it should continue to apply ASC 740 on the basis of the provision of the tax laws that were in effect immediately before the enactment of the Act. Based on our initial analysis of the Tax Act, the Company has made reasonable estimates of its 2017 impact. As a result of the federal corporate tax rate reduction from 35% to 21%, we re-measured certain deferred tax assets and liabilities, which resulted in a reduction in our DTA of approximately $4.1 million, that was offset by a decrease in our valuation allowance. As guidance and technical corrections, if any, are provided in the upcoming quarters, the Company will adjust its provisional estimates as required.

The primary difference between the income tax benefit at the statutory rate and the Company’s effective income tax expense for the year ended December 31, 2017 was primarily attributable to the change in our valuation allowance and foreign operations.

Significant components of the Company’s deferred tax assets are shown below (in thousands):

	Year Ended December 31,
	2016			2017
Net operating loss and tax credit carryforwards		$	42,851		$	38,948
Depreciation, amortization and impairment of property and equipment			137			111
Stock options			2,365			1,807
Research and development credits			4,021			4,021
Other			—			—
Deferred tax assets			49,374			44,887
Valuation allowance for deferred tax assets			(49,374)			(44,887)
Net deferred tax assets		$	—		$	—

Deferred income taxes reflect the net tax effect of temporary differences between the carrying amounts of assets and liabilities for financial reporting and tax purposes. The Company adopted a 17% tax rate as of December 31, 2017 in respect of the measurement of deferred taxes arising in the United Kingdom, which reflects the currently enacted tax rate and the anticipated timing of the unwinding of the deferred tax balances. In respect of the measurement of deferred taxes arising in the U.S, the Company has adopted a 21% tax rate as of December 31, 2017. This has reduced from 34% as of December 31, 2016 due to changes in U.S. tax laws enacted in December 2017. The effect of the change in tax rates on the consolidated statement of operations is $nil, after consideration of the change in valuation allowance.

A valuation allowance has been established, as realization of such assets is uncertain. The Company’s management evaluated the positive and negative evidence bearing upon the realizability of its deferred assets, and has determined that, at present, the Company may not be able to recognize the benefits of the deferred tax assets under the more likely than not criteria. Accordingly, a valuation allowance of approximately $44.9 million has been established at December 31, 2017. The valuation allowance has decreased by approximately $4.5 million in 2017.

In certain circumstances, as specified in the Tax Reform Act of 1986, due to ownership changes, the Company’s ability to utilize its net operating loss (“NOL”) carryforwards may be limited. The benefit of deductions from the exercise of stock options is included in the NOL carryforwards. As of December 31, 2016 and 2017, the Company had federal NOLs of $28.4 million and $28.4 million and foreign NOLs of $178.2 million and $186.2 million, respectively. The Company’s federal NOLs will start to expire in 2026, and the state NOLs totaling $18.7 million will start expiring in 2023. The Company’s foreign NOL’s do not expire under UK tax law. However, for losses created after April 1, 2017 the use of these NOLs is restricted to an annual £5 million allowance in each standalone company or group and above this allowance, there will be a 50% restriction in the profits that can be covered by losses brought forward. The amount of profits restricted for the year ended December 31, 2017 is $0. As of December 31, 2017, the Company had a US R&D credit carryforward of $4.0 million which will start expiring in 2019.

Utilization of the NOLs may be subject to a substantial annual limitation under Section 382 of the Internal Revenue Code of 1986 due to ownership change limitations that have occurred previously or that could occur in the future. These ownership changes may limit the amount of NOL and R&D credit carryforwards that can be utilized annually to offset future taxable income and tax, respectively. The Company completed a Section 382 study as of June 30, 2014 noting there was no ownership change from the Company’s formation through that date. No update to this study has been performed through December 31, 2017. Management has evaluated all significant tax positions at December 31, 2016 and 2017 and concluded that there are no material uncertain tax positions. The Company would recognize both interest and penalties related to unrecognized benefits in income tax expense. The Company has not recorded any interest and penalties on any unrecognized tax benefits since its inception.

Tax year 2016 remains open to examination by major taxing jurisdictions to which the Company is subject, which are primarily in the United Kingdom and the United States, as carryforward attributes generated in years past may still be adjusted upon examination by the United Kingdom’s H.M. Revenue & Customs, the Internal Revenue Service (“IRS”) or state tax authorities. The Company is currently not under examination by the IRS or any other jurisdictions for any tax years.

We have not provided a deferred tax liability on the cumulative amount of unremitted foreign earnings of international subsidiaries because it is our intent to permanently reinvest such earnings outside of the United States.

The Company has an aggregate deficit in foreign earnings and therefore has not provided any deferred tax liability on its outside book-tax basis difference in its foreign subsidiaries and because it is also our intent to permanently reinvest any earnings outside of the United States. We would recognize this deferred tax liability if we were to experience a change in circumstances producing a change in that intention. As a result of the repeal of the Section 902 foreign tax credit under the Tax Act, future distributions would not be offset by a foreign tax credit.

Net Loss Per Share

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Net Loss Per Share

14. Net Loss Per Share

Basic and diluted net loss per share attributable to common stockholders was calculated as follows:

	Years ended December 31,
	2016			2017
Numerator:
Net loss		$	(11,791)		$	(7,470)
Dividend on convertible exchangeable preferred shares		$	(200)		$	(201)
Beneficial conversion feature of Series A convertible stock		$	—		$	(3,638)
Conversion of Series A convertible preferred stock		$	—		$	(3,537)
Net loss attributable to common shareholders		$	(11,991)		$	(14,846)
Denominator:
Weighted-average number of common shares used in loss per share – basic and diluted			3,424,976			7,631,152
Loss per share – basic and diluted		$	(3.50)		$	(1.95)

Potential dilutive securities have been excluded from the computation of diluted net loss per share as the effect would be to reduce the net loss per share. Therefore, the weighted average number of common shares outstanding used to calculate both basic and diluted net loss per share attributable to common stockholders is the same. The Company excluded the following potential common shares, presented based on amounts outstanding at each period end, from the computation of diluted net loss per share attributable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect:

	Year ended December 31,
	2016		2017
Stock options		389,378		535,616
Convertible preferred stock		1,698		1,698
Series A preferred stock		—		132,000
Common stock warrants		—		7,490,500
Total shares excluded from calculation		391,076		8,159,814

Geographic Information

12 Months Ended

Dec. 31, 2017

Geographic Information

Geographic Information

15. Geographic Information

Geographic information for the years ended December 31, 2016 and 2017 is as follows (in thousands):

	Year Ended December 31,
	2016			2017
Revenue
United Kingdom		$	843		$	—
Total Revenue		$	843		$	—
Net loss
United States		$	(2,211)		$	(127)
United Kingdom			(9,580)			(7,343)
Total Net Loss		$	(11,791)		$	(7,470)

	December 31,
	2016			2017
Total Assets
United States		$	15,197		$	23,522
United Kingdom			4,465			2,481
Total Assets		$	19,662		$	26,003
Long Lived Assets, net
United States		$	2		$	0
United Kingdom			43			29
Total Long Lived Assets, net		$	45		$	29

Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2017
Subsequent Events
Subsequent Events	16. Subsequent Events On March 7, 2018, the Board of Directors declared a quarterly cash dividend in the amount of $0.15 per share on the Company’s Preferred Stock. The cash dividend is due to be paid on May 1, 2018 to the holders of record of the Preferred Stock as of the close of business on April 11, 2018.

Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 31, 2017
Summary of Significant Accounting Policies
Use of Estimates	Use of Estimates The preparation of financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities and related disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Critical estimates include inputs used to determine clinical trial accruals, stock-based compensation expense and the recognition of revenue. Cyclacel reviews its estimates on an ongoing basis. The estimates are based on historical experience and on various other assumptions that the Company believes to be reasonable under the circumstances. Actual results may differ from these estimates. Cyclacel believes the judgments and estimates required by the following accounting policies to be significant in the preparation of the Company’s consolidated financial statements.
Foreign Currency and Currency Translation	Foreign Currency and Currency Translation Transactions that are denominated in a foreign currency are remeasured into the functional currency at the current exchange rate on the date of the transaction. Any foreign currency-denominated monetary assets and liabilities are subsequently remeasured at current exchange rates, with gains or losses recognized as foreign exchange (losses) gains in the statement of operations. The assets and liabilities of the Company’s international subsidiary are translated from its functional currency into United States dollars at exchange rates prevailing at the balance sheet date. Average rates of exchange during the period are used to translate the statement of operations, while historical rates of exchange are used to translate any equity transactions. Translation adjustments arising on consolidation due to differences between average rates and balance sheet rates, as well as unrealized foreign exchange gains or losses arising from translation of intercompany loans that are of a long-term-investment nature, are recorded in other comprehensive loss.
Cash and Cash Equivalents	Cash and Cash Equivalents Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash and cash equivalents. The Company considers all highly liquid investments with an original maturity of three months or less at the time of initial purchase to be cash equivalents. The objectives of the Company’s cash management policy are to safeguard and preserve funds, to maintain liquidity sufficient to meet Cyclacel’s cash flow requirements and to attain a market rate of return. The Company deposits its cash in financial institutions that it believes have high credit quality and has not experienced any losses on such accounts and does not believe it is exposed to any significant credit risk on cash and cash equivalents. The Company’s cash and cash equivalents balance at December 31, 2017 was $23.9 million and it maintains its cash accounts in several entities both within the United States and the United Kingdom. The total cash balances for amounts held in the United States are insured by the Federal Deposit Insurance Corporation (“FDIC”) up to $250,000 per account. The Company has cash balances exceeding the balance insured by the FDIC that totaled approximately $23.0 million at December 31, 2017. The total cash balances for amounts held in the United Kingdom are insured by the UK Government Financial Services Compensation Scheme (“FSCS”) up to £75,000 per account. The Company has cash balances exceeding the balance insured by the FSCS that totaled approximately $0.5 million at December 31, 2017.
Property and Equipment	Property and Equipment The components of property and equipment are stated at cost and depreciated on a straight-line basis over the estimated useful lives of the related assets, which are generally three to five years. Amortization of leasehold improvements is performed using the straight-line method over the shorter of the remaining lease term or the estimated useful life of the related assets, currently between five and fifteen years. Upon sale or retirement of assets, the costs and related accumulated depreciation and amortization are removed from the balance sheet and the resulting gain or loss on sale is reflected as a component of operating income or loss. Expenditures for maintenance and repairs are charged to operating expenses as incurred.
Impairment of Long-lived Assets	Impairment of Long-lived Assets The Company reviews property and equipment for impairment whenever events or changes in business circumstances indicate that the carrying amount of the assets may not be fully recoverable. The Company assesses the recoverability of the potentially affected long-lived assets by determining whether the carrying value of such assets can be recovered through undiscounted future operating cash flows. Impairment, if any, is measured as the amount by which the carrying amount of a long-lived asset (or asset group) exceeds its fair value.
Fair Value of Financial Instruments	Fair Value of Financial Instruments Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. Assets and liabilities measured at fair value are classified and disclosed in one of the following three levels of the fair value hierarchy, of which the first two are considered observable and the last is considered unobservable: • Level 1 — Quoted prices in active markets for identical assets or liabilities. • Level 2 — Observable inputs (other than Level 1 quoted prices), such as quoted prices in active markets for similar assets or liabilities, quoted prices in markets that are not active for identical or similar assets or liabilities, or other inputs that are observable or can be corroborated by observable market data. • Level 3 — Unobservable inputs that are supported by little or no market activity that are significant to determining the fair value of the assets or liabilities, including pricing models, discounted cash flow methodologies and similar techniques. The carrying values of cash and cash equivalents, other receivables, accounts payable and accrued expenses approximate their fair values due to the short-term nature of these assets and liabilities.
Segments	Segments The Company is managed and operated as one business which is focused on using cell cycle, transcriptional regulation and DNA damage response biology to develop innovative, targeted medicines for cancer and other proliferative diseases. The entire business is managed by a single management team that reports to the Chief Executive Officer. The Company does not operate separate lines of business with respect to any of its products or product candidates and the Company does not prepare discrete financial information with respect to separate products or product candidates or by location. Accordingly, the Company views its business as one reportable operating segment with development operations in two geographic areas, namely the United States and the United Kingdom.
Revenue Recognition	Revenue Recognition Collaboration, supply and licensing agreements Consideration received is allocated to each of the separable elements in an arrangement using the relative selling price method. An element is separable if it has value to the customer on a stand-alone basis. The selling price used for each separable element will be based on vendor-specific objective evidence (“VSOE”) if available, third party evidence if VSOE is not available, or estimated selling price if neither VSOE nor third party evidence is available. The best estimate of the selling price is determined after considering all reasonably available information, including market data and conditions, entity-specific factors such as the cost structure of the deliverable and internal profit and pricing objectives. Revenue is recognized for each separate element when persuasive evidence of an arrangement exists; delivery has occurred or services have been rendered; the fee is fixed or determinable; and collectability is reasonably assured. Milestone payments which are non-refundable, non-creditable and contingent on achieving clinical milestones are recognized as revenues either on achievement of such milestones if the milestones are considered substantive or over the period the Company has continuing performance obligations, if the milestones are not considered substantive. When determining if a milestone is substantive, the Company considers the following factors: • The degree of certainty in achieving the milestone • The frequency of milestone payments • The Company’s efforts, which result in achievement of the milestone • The amount of the milestone payment relative to the other deliverables and payment terms, and • Whether the milestone payment is related to future performance or deliverables The Company records as deferred revenue any amounts received prior to satisfying the revenue recognition criteria. Deferred revenue not expected to be recognized within the next twelve months is reported as non-current deferred revenue. The Company recognized $0 and $0.2 million deferred revenue as of December 31, 2016 and 2017 respectively. The deferred revenue reported as of December 31, 2017 relates to a prepayment received from ManRos Therapeutics SA for a development milestone that is not expected to be achieved until mid-2018 (see Note 3 for additional details). Royalty income is recognized when the licensee sells the underlying product. Grant revenue Grant revenues from government agencies and private research foundations are recognized as the related qualified research and development costs are incurred, up to the limit of the prior approval funding amounts. Grant revenues are not refundable.
Other Income	Other Income Other income is primarily related to royalty income received under a historical Asset Purchase Agreement for activities which are not part of the Company’s ongoing operations and activities.
Research and Development Expenditures	Research and Development Expenditures Research and development expenses consist primarily of costs associated with the Company’s product candidates, upfront fees, milestones, compensation and other expenses for research and development personnel, supplies and development materials, costs for consultants and related contract research, facility costs and depreciation. Expenditures relating to research and development are expensed as incurred.
Clinical Trial Accounting	Clinical Trial Accounting Data management and monitoring of the Company’s clinical trials are performed with the assistance of contract research organizations (“CROs”) or clinical research associates (“CRAs”) in accordance with the Company’s standard operating procedures. Typically, CROs and CRAs bill monthly for services performed, and others bill based upon milestones achieved. For outstanding amounts, the Company accrues unbilled clinical trial expenses based on estimates of the level of services performed each period. Costs of setting up clinical trial sites for participation in the trials are recognized upon execution of the clinical trial agreement and expensed immediately as research and development expenses. Clinical trial costs related to patient enrollment are accrued as patients are entered into and progress through the trial.
Patent Costs	Patent Costs Patent prosecution costs are charged to general and administrative expenses as incurred as recoverability of such expenditure is uncertain.
Leased Assets	Leased Assets The costs of operating leases are charged to operations on a straight-line basis over the lease term. Operating leases relate primarily to the Company’s research and development facilities and corporate headquarters.
Stock-based Compensation	Stock-based Compensation The Company measures all stock options and other stock-based awards granted to employees and directors based on the fair value on the date of the grant and recognizes compensation expense of those awards, over the requisite service period, which for the Company is the period between the grant date and the date the award vests or becomes exercisable. Most of the awards granted by the Company (and still outstanding) vest ratably over three or four years. However, certain awards granted to members of the Company’s Board of Directors vest in their entirety on the one-year anniversary following the date of grant. Generally, the Company issues stock options and restricted stock awards to employees with only service-based vesting conditions and records the expense for these awards using the straight-line method. However, in certain years, the Company granted restricted stock units to employees that were dependent upon the fulfillment of certain clinical and financial conditions. In such instances where the performance condition must be met for the award to vest, the company only recognizes expense in the period that the award becomes probable of vesting (See Note 11 — Stock-Based Compensation). The Company classifies stock-based compensation expense in its statement of operations in the same manner in which the award recipient’s payroll costs are classified. The Company accounts for forfeitures as they occur. The fair value of restricted stock and restricted stock units is determined based on the number of shares granted and the quoted price of the Company’s common stock on the date of grant. The determination of grant-date fair value for stock option awards is estimated using the Black-Scholes model, which includes variables such as the expected volatility of the Company’s share price, expected term of the award, interest rates, and dividend yields. The Company relies exclusively on its historical volatility as an input to the option pricing model as management believes that this rate will be representative of future volatility over the expected term of the options. The expected term assumption is estimated using past history of early exercise behavior and expectations about future behaviors. The weighted average risk-free interest rate represents interest rate for treasury constant maturities published by the Federal Reserve Board. If the term of available treasury constant maturity instruments is not equal to the expected term of an employee option, Cyclacel uses the weighted average of the two Federal Reserve securities closest to the expected term of the employee option. The expected dividend yield is based on the fact that the Company has never paid cash dividends on common stock and does not expect to pay any cash dividends in the foreseeable future.
Income Taxes	Income Taxes The Company accounts for income taxes using the liability method. Under this method, deferred tax assets and liabilities are determined based on the difference between the financial statement and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to affect taxable income. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts expected to be realized. The Company accounts for uncertainty in income taxes recognized in the financial statements by applying a two-step process to determine the amount of tax benefit to be recognized. First, the tax position must be evaluated to determine the likelihood that it will be sustained upon external examination by the taxing authorities. If the tax position is deemed more-likely-than-not to be sustained, the tax position is then assessed to determine the amount of benefit to recognize in the financial statements. The amount of the benefit that may be recognized is the largest amount that has a greater than 50% likelihood of being realized upon ultimate settlement. The provision for income taxes includes the effects of any resulting tax reserves, or unrecognized tax benefits, that are considered appropriate as well as the related net interest and penalties. Credit is taken in the accounting period for research and development tax credits, which will be claimed from H.M. Revenue & Customs (“HMRC”), the United Kingdom’s taxation and customs authority, in respect of qualifying research and development costs incurred in the same accounting period.
Net Loss Per Common Share	Net Loss Per Common Share The Company calculates net loss per common share in accordance with ASC 260 “Earnings Per Share” (“ASC 260”). Basic and diluted net loss per common share was determined by dividing net loss applicable to common stockholders by the weighted average number of common shares outstanding during the period. In periods in which the Company reports a net loss attributable to common stockholders, diluted net loss per share attributable to common stockholders is the same as basic net loss per share attributable to common stockholders since dilutive common shares are not assumed to have been issued if their effect is anti-dilutive. The Company reported a net loss attributable to common stockholders for the years ended December 31, 2016 and 2017.
Comprehensive Income (Loss)	Comprehensive Income (Loss) All components of comprehensive income (loss), including net income (loss), are reported in the financial statements in the period in which they are recognized. Comprehensive income (loss) is defined as the change in equity during a period from transactions and other events and circumstances from non-owner sources. Net income (loss) and other comprehensive income (loss), including foreign currency translation adjustments, are reported, net of any related tax effect, to arrive at comprehensive income (loss). No taxes were recorded on items of other comprehensive income (loss). There were no reclassifications out of other comprehensive income (loss) during the years ended December 31, 2016 and 2017.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In July 2017, the FASB issued Accounting Standards Update (“ASU”) No. 2017-11, Accounting for Certain Financial Instruments with Down Round Features (“ASU 2017-11”), which simplifies the accounting for certain financial instruments with down-round features. A down round feature is a provision in a financial instrument that reduces the strike price of an issued financial instrument if the issuer sells shares of its stock for an amount less than the currently stated strike price of the issued financial instrument or issues an equity-linked financial instrument with a strike price below the currently stated strike price of the issued financial instrument. ASU 2017-11 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted, including adoption in an interim period. ASU 2017-11 should be adopted retrospectively for each prior reporting period presented or retrospectively as of the beginning of the year of adoption. The Company anticipates this standard will not have a material impact on its consolidated financial statements. In October 2016, the FASB issued ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfer of Assets Other than Inventory (“ASU 2016-16”), which requires the recognition of the income tax consequences of an intra-entity transfer of an asset, other than inventory, when the transfer occurs. The standard is effective for annual periods beginning after December 15, 2017, including interim periods within those fiscal years. This standard will not have a material impact on the company’s consolidated financial statements. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments (“ASU 2016-15”), to address diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The standard is effective for annual periods beginning after December 15, 2017, including interim periods within those fiscal years. This standard will not have a material impact on the company’s consolidated financial statements. In February 2016, the FASB issued guidance on accounting for leases in ASU No, 2016-02. The guidance requires that lessees recognize a lease liability, which is a lessee’s obligation to make lease payments arising from a lease, measured on a discounted basis; and a right-of-use asset, which is an asset that represents the lessee’s right to use, or control the use of, a specified asset for the lease term at the commencement date. The guidance is effective for fiscal years beginning after December 15, 2018. Early application is permitted. The guidance must be adopted on a modified retrospective transition approach for leases existing, or entered into after, the beginning of the earliest comparative period presented in the financial statements. The Company is currently evaluating the impact of the guidance on the consolidated financial statements. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”), which supersedes existing revenue recognition guidance. The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the Company expects to be entitled in exchange for those goods or services. The standard defines a five-step process to achieve this principle; (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when, or as, the Company satisfies a performance obligation. ASU 2014-09 also requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts. The guidance is effective for annual periods beginning after December 15, 2017 and for interim periods within those fiscal years. ASU 2014-09 was amended by multiple accounting standards updates from 2014-2016. The Company anticipates this standard will not have a material impact on its consolidated financial statements. The Company currently believes the most significant impact relates to its accounting for revenues related to grants received from government agencies or nonprofit organizations. Under the new standard, the Company expects to report the inflows from the types of grants it typically receives in other income (or in some cases as a contra-expense). Historically, grants have been reported in revenue. As the grantor is not likely to be receiving a good or service in exchange for the payment, the grant cannot be reported in revenue under ASU 2014-09. The Company also expects to recognize revenue associated with contingent milestone-based payments at the time the contingent event is probable to be met, rather than when the milestone is achieved. However, given the limited number of potential milestones owed to Cyclacel, and the inherent risk involved in developing drugs, the timing of revenue recognition associated with contingent milestones is unlikely to be significantly impacted. ASU 2014-09 permits two methods of adoption: retrospectively to each prior reporting period presented (full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the modified retrospective method). The Company intends to use the modified retrospective method upon adoption of the new accounting standard, and does not anticipate recording a material adjustment to opening accumulated deficit as of the date of adoption.

Cash and Cash Equivalents (Tables)

12 Months Ended

Dec. 31, 2017

Cash and Cash Equivalents

Schedule of summary of cash and cash equivalents

	December 31,
	2016			2017
Cash		$	5,332		$	1,103
Investments with original maturity of less than three months at the time of purchase			11,188			22,807
Total cash and cash equivalents		$	16,520		$	23,910

Fair Value of Financial Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value

Schedule of financial assets and liabilities measured on a recurring basis

	Fair Value Measurements as of December 31, 2016 Using:
	Level 1			Level 2			Level 3			Total
Assets:
Cash equivalents		$	11,188		$	—		$	—		$	11,188
Total Assets		$	11,188		$	—		$	—		$	11,188

	Fair Value Measurements as of December 31, 2017 Using:
	Level 1			Level 2			Level 3			Total
Assets:
Cash equivalents		$	22,807		$	—		$	—		$	22,807
Total Assets		$	22,807		$	—		$	—		$	22,807

Prepaid Expenses and Other Current Assets (Tables)

12 Months Ended

Dec. 31, 2017

Prepaid Expenses And Other Current Assets [Abstract]

Schedule of prepaid expenses and other current assets

	December 31,
	2016			2017
Research and development tax credit receivable		$	1,730		$	1,054
Prepayments			867			363
Delaware tax receivable			—			25
VAT receivable			327			409
Deposits			132			132
Other current assets			41			81
Prepaid expenses and other current assets		$	3,097		$	2,064

Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment

Schedule of property and equipment

	Lives in years	December 31,
	Lives in years	2016			2017
Leasehold improvements	5 to 15		$	792		$	835
Research and laboratory equipment	3 to 5			4,438			4,854
Office equipment and furniture	3 to 5			1,157			1,236
				6,387			6,925
Less: accumulated depreciation and amortization				(6,342)			(6,896)
			$	45		$	29

Accrued and Other Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Accrued and Other Current Liabilities

Schedule of accrued and other current liabilities

	December 31,
	2016			2017
Accrued research and development		$	2,138		$	1,645
Accrued legal and professional fees			194			248
Other current liabilities			430			662
		$	2,762		$	2,555

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies

Schedule of the Company's contractual obligations and commitments relating to its facilities leases

	Operating Lease Obligation
2018		$	348
2019			344
2020			344
2021			344
2022			343
thereafter			956
Total future minimum lease obligations		$	2,679

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Stock-Based Compensation Arrangements

Schedule of stock based compensation expense

	Year Ended December 31, 2016			Year Ended December 31, 2017
Research and development		$	305		$	72
General and administrative			477			194
Stock-based compensation costs before income taxes		$	782		$	266

Schedule of stock option activity

	Number of Options Outstanding		Weighted Average Exercise Price Per Share			Weighted Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value ($000s)
Options outstanding at December 31, 2015		206,298		$	72.60		8.09		$	—
Granted		197,841		$	4.68
Exercised		—
Cancelled/forfeited		(14,760)		$	396.83
Options outstanding at December 31, 2016		389,379		$	25.80		5.83		$	121
Granted		170,853		$	1.93
Exercised		—
Cancelled/forfeited		(24,615)		$	179.92
Options outstanding at December 31, 2017		535,617		$	11.10		8.23		$	—
Unvested at December 31, 2017		386,682		$	3.64		8.84		$	—
Vested and exercisable at December 31, 2017		148,755		$	30.49		6.65		$	—

Schedule of fair value of the stock options granted

	Year ended December 31, 2016	Year ended December 31, 2017
Expected term (years)	5 – 6	6
Risk free interest rate	1.370% – 1.500%	1.890% – 2.265%
Volatility	98% – 104%	108%
Expected dividend yield over expected term	0.00%	0.00%
Resulting weighted average grant date fair value	$3.66	$1.59

Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Taxes

Schedule of components of (loss) income before taxes from continuing operations

	Year Ended December 31,
	2016			2017
Domestic		$	(2,011)		$	(127)
Foreign			(11,763)			(8,336)
Loss from continuing operations before taxes		$	(13,774)		$	(8,463)

The benefit (provision) for income taxes from continuing operations consists of the following (in thousands):

	Year Ended December 31,
	2016			2017
Current – domestic		$	—		$	—
Current – foreign			1,983			993
Current – total			1,983			993
Deferred – domestic			—			—
Income tax benefit		$	1,983		$	993

Schedule of benefit for income taxes from continuing operations

	Year Ended December 31,
	2016			2017
Current – domestic		$	—		$	—
Current – foreign			1,983			993
Current – total			1,983			993
Deferred – domestic			—			—
Income tax benefit		$	1,983		$	993

Schedule of reconciliation of the (benefit) provision for income taxes from continuing operations with the amount computed by applying the statutory federal tax rate to loss before income taxes

	Year Ended December 31,
	2016			2017
Loss from continuing operations before taxes		$	(13,774)		$	(8,463)
Income tax expense computed at statutory federal tax rate			(4,683)			(2,877)
Disallowed expenses and non-taxable income			12			3
Loss surrendered to generate R&D credit			1,945			856
Additional research and development tax relief			(2,827)			(1,262)
Change in valuation allowance			2,029			(4,487)
Foreign items, including change in tax rates, and other			1,238			1,901
Change in US Tax Rate			—			4,112
Other foreign items			303			761
		$	(1,983)		$	(993)

Schedule of significant components of the entity's deferred tax assets

	Year Ended December 31,
	2016			2017
Net operating loss and tax credit carryforwards		$	42,851		$	38,948
Depreciation, amortization and impairment of property and equipment			137			111
Stock options			2,365			1,807
Research and development credits			4,021			4,021
Other			—			—
Deferred tax assets			49,374			44,887
Valuation allowance for deferred tax assets			(49,374)			(44,887)
Net deferred tax assets		$	—		$	—

Net Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Schedule of basic and diluted net loss per share

	Years ended December 31,
	2016			2017
Numerator:
Net loss		$	(11,791)		$	(7,470)
Dividend on convertible exchangeable preferred shares		$	(200)		$	(201)
Beneficial conversion feature of Series A convertible stock		$	—		$	(3,638)
Conversion of Series A convertible preferred stock		$	—		$	(3,537)
Net loss attributable to common shareholders		$	(11,991)		$	(14,846)
Denominator:
Weighted-average number of common shares used in loss per share – basic and diluted			3,424,976			7,631,152
Loss per share – basic and diluted		$	(3.50)		$	(1.95)

Schedule of company's potential anti dilutive securities

	Year ended December 31,
	2016		2017
Stock options		389,378		535,616
Convertible preferred stock		1,698		1,698
Series A preferred stock		—		132,000
Common stock warrants		—		7,490,500
Total shares excluded from calculation		391,076		8,159,814

Geographic Information (Tables)

12 Months Ended

Dec. 31, 2017

Geographic Information

Schedule of geographic information

	Year Ended December 31,
	2016			2017
Revenue
United Kingdom		$	843		$	—
Total Revenue		$	843		$	—
Net loss
United States		$	(2,211)		$	(127)
United Kingdom			(9,580)			(7,343)
Total Net Loss		$	(11,791)		$	(7,470)

	December 31,
	2016			2017
Total Assets
United States		$	15,197		$	23,522
United Kingdom			4,465			2,481
Total Assets		$	19,662		$	26,003
Long Lived Assets, net
United States		$	2		$	0
United Kingdom			43			29
Total Long Lived Assets, net		$	45		$	29

Organization of the Company and Basis of Presentation (Detail Textuals) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	May 27, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Organization of the Company
Net loss		$ (7,470)	$ (11,791)
Accumulated deficit		(342,509)	(335,039)
Cash and cash equivalents		$ 23,910	$ 16,520	$ 20,440
Stockholders' equity, reverse stock split	one-for-twelve
Common stock, par value (in dollars per share)		$ 0.001	$ 0.001

Organization of the Company and Basis of Presentation (Detail Textuals 1) - shares	Dec. 31, 2017	May 27, 2017	Dec. 31, 2016
Organization Of Company And Basis Of Presentation Line Items
Common stock, shares outstanding (in shares)	11,997,447		4,256,829
Before Reverse Stock Split
Organization Of Company And Basis Of Presentation Line Items
Common stock, shares outstanding (in shares)		36,075,730
After Reverse Stock Split
Organization Of Company And Basis Of Presentation Line Items
Common stock, shares outstanding (in shares)		3,006,311

Summary of Significant Accounting Policies (Detail Textuals)	12 Months Ended
	Dec. 31, 2017 USD ($) Segment	Dec. 31, 2017 EUR (€) Segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Accounting Policies [Line Items]
Cash and cash equivalents	$ 23,910,000		$ 16,520,000	$ 20,440,000
Cash balances insured by FDIC	250,000
Cash exceeding balance insured by FDIC	23,000,000
Cash balance insured by FSCS \| €		€ 75,000
Cash exceeding balance insured by FSCS	$ 500,000
Number of operating segments \| Segment	1
Number of geographic areas for development operations \| Segment	2	2
Deferred revenue	$ 200,000		$ 0
Property, plant and equipment \| Minimum
Accounting Policies [Line Items]
Estimated useful life	3 years
Property, plant and equipment \| Maximum
Accounting Policies [Line Items]
Estimated useful life	5 years
Leasehold improvements \| Minimum
Accounting Policies [Line Items]
Estimated useful life	5 years
Leasehold improvements \| Maximum
Accounting Policies [Line Items]
Estimated useful life	15 years

Significant Contracts (Detail Textuals) - USD ($)	12 Months Ended
Significant Contracts (Detail Textuals) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Supply Commitment [Line Items]
Collaboration and research and development revenue	$ 0	$ 0
Daiichi Sankyo
Supply Commitment [Line Items]
Future milestone payments payable	$ 10,000,000
Period for which royalties will be paid following first commercial sale of licensed products	10 years
Notice period for termination of license by the entity for technical, scientific, efficacy, safety, or commercial reasons	6 months
Notice period for termination of license after launch of a sapacitabine-based product by the entity, or by either party for material default	12 months
ManRos Therapeutics SA ("ManRos") \| Collaboration, Supply and Licensing Agreements
Supply Commitment [Line Items]
Payment received from achieving a clinical milestone	$ 150,000

Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash and Cash Equivalents
Cash	$ 1,103	$ 5,332
Investments with original maturity of less than three months at the time of purchase	22,807	11,188
Total cash and cash equivalents	$ 23,910	$ 16,520	$ 20,440

Fair Value of Financial Assets and Liabilities (Details) - Recurring basis - Total - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets:
Cash equivalents	$ 22,807	$ 11,188
Total Assets	22,807	11,188
Level 1
Assets:
Cash equivalents	22,807	11,188
Total Assets	22,807	11,188
Level 2
Assets:
Cash equivalents	0	0
Total Assets	0	0
Level 3
Assets:
Cash equivalents	0	0
Total Assets	$ 0	$ 0

Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Prepaid Expense and Other Assets, Current [Abstract]
Research and development tax credit receivable	$ 1,054	$ 1,730
Prepayments	363	867
Delaware tax receivable	25	0
VAT receivable	409	327
Deposits	132	132
Other current assets	81	41
Prepaid expenses and other current assets	$ 2,064	$ 3,097

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, plant and equipment
Property, plant and equipment, gross	$ 6,925	$ 6,387
Less: accumulated depreciation and amortization	(6,896)	(6,342)
Property, Plant and Equipment, Net	29	45
Leasehold improvements
Property, plant and equipment
Property, plant and equipment, gross	$ 835	792
Leasehold improvements \| Minimum
Property, plant and equipment
Lives in years	5 years
Leasehold improvements \| Maximum
Property, plant and equipment
Lives in years	15 years
Research and laboratory equipment
Property, plant and equipment
Property, plant and equipment, gross	$ 4,854	4,438
Research and laboratory equipment \| Minimum
Property, plant and equipment
Lives in years	3 years
Research and laboratory equipment \| Maximum
Property, plant and equipment
Lives in years	5 years
Office equipment and furniture
Property, plant and equipment
Property, plant and equipment, gross	$ 1,236	$ 1,157
Office equipment and furniture \| Minimum
Property, plant and equipment
Lives in years	3 years
Office equipment and furniture \| Maximum
Property, plant and equipment
Lives in years	5 years

Property, Plant and Equipment (Detail Textuals) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment
Depreciation and amortization expense	$ 32,000	$ 100,000
Proceeds from sale of asset		$ 12,000

Accrued and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accrued and Other Current Liabilities
Accrued research and development	$ 1,645	$ 2,138
Accrued legal and professional fees	248	194
Other current liabilities	662	430
Total	$ 2,555	$ 2,762

Accrued and Other Current Liabilities (Detail Textuals)	12 Months Ended
Accrued and Other Current Liabilities (Detail Textuals)	Dec. 31, 2017 USD ($)
ManRos Therapeutics SA ("ManRos") \| Collaboration, Supply and Licensing Agreements
Accrued And Other Current Liabilities [Line Items]
Payment received from achieving a clinical milestone	$ 150,000

Commitments and Contingencies (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Operating Lease Obligation
2018	$ 348
2019	344
2020	344
2021	344
2022	343
thereafter	956
Total future minimum lease obligations	$ 2,679

Commitments and Contingencies (Detail Textuals) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Oct. 31, 2000	Dec. 31, 2017	Dec. 31, 2016
Leases, related disclosures
Lease term for research and development facility	25 years
Rent expense, net		$ 0.5	$ 0.5

Stockholders' Equity (Detail Textuals) - USD ($)	1 Months Ended		12 Months Ended
Stockholders' Equity (Detail Textuals) - USD ($)	Jul. 31, 2017	Jul. 21, 2017	Dec. 31, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Preferred stock, par value (in dollars per share)			$ 0.001	$ 0.001
Proceeds from issuance of common stock			$ 14,749,000	$ 6,794,000
Common Stock
Subsequent Event [Line Items]
Number of shares issued upon conversion			132,000
Number of common stock issued			3,154,000
Series A Preferred Stock
Subsequent Event [Line Items]
Number of shares issued upon conversion			8,608
Price per share used to determine number of shares of common stock	$ 1,000
Underwritten Public Offering \| Ladenburg Thalmann & Co. Inc.
Subsequent Event [Line Items]
Proceeds from issuance of common stock		$ 13,700,000
Underwritten Public Offering \| Ladenburg Thalmann & Co. Inc. \| Series A Preferred Stock
Subsequent Event [Line Items]
Aggregate intrinsic value of stock		$ 3,638,000
Underwritten Public Offering \| Ladenburg Thalmann & Co. Inc. \| Class A Units
Subsequent Event [Line Items]
Share price per unit (in dollars per share)		$ 2
Number of units authorized for issuance and sale		3,154,000
Underwritten Public Offering \| Ladenburg Thalmann & Co. Inc. \| Class A Units \| Common Stock
Subsequent Event [Line Items]
Number of securities called by each unit		1
Number of securities called by each warrant		1
Underwritten Public Offering \| Ladenburg Thalmann & Co. Inc. \| Class B Units
Subsequent Event [Line Items]
Share price per unit (in dollars per share)		$ 1,000
Number of units authorized for issuance and sale		8,872
Underwritten Public Offering \| Ladenburg Thalmann & Co. Inc. \| Class B Units \| Common Stock
Subsequent Event [Line Items]
Number of shares issued upon conversion		500
Price per share used to determine number of shares of common stock		$ 1,000.00
Underwritten Public Offering \| Ladenburg Thalmann & Co. Inc. \| Class B Units \| Series A Preferred Stock
Subsequent Event [Line Items]
Number of securities called by each unit		1
Preferred stock, par value (in dollars per share)		$ 0.001

Stockholders' Equity (Detail Textuals 1) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 23, 2016	Dec. 31, 2017
Stockholders' equity
Sale of stock, value		$ 13,684
FBR (the "FBR Sales Agreement")
Stockholders' equity
Percentage of commission on gross equity sales	3.00%
Number of common stock issued		183,118
Sale of stock, value		$ 1,100

Stockholders' Equity (Detail Textuals 2) - USD ($) $ in Thousands		12 Months Ended
	Jul. 10, 2015	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Proceeds from issuance of equity securities, net of issuance costs		$ 14,749	$ 6,794
Controlled Equity Offering Sales Agreement \| Cantor Fitzgerald & Co., ("Cantor")
Class of Stock [Line Items]
Maximum amount of offering price for common stock	$ 8,350
Percentage of commission on gross equity sales	3.00%
Number of common stock issued	114,078		41,996
Proceeds from issuance of equity securities, net of issuance costs			$ 200

Stockholders' Equity (Detail Textuals 3) - USD ($)	12 Months Ended
Stockholders' Equity (Detail Textuals 3) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Stockholders' Equity
Number of warrant outstanding	$ 7,490,500
Warrant exercise price	$ 2.00
Condition related to exercising warrants	The Warrants expire in 2024. Subject to limited exceptions, a holder of warrants will not have the right to exercise any portion of its warrants if the holder (together with such holder's affiliates, and any persons acting as a group together with such holder or any of such holder's affiliates) would beneficially own a number of shares of common stock in excess of 4.99% (or, at the election of the purchaser, 9.99%) of the shares of our Common Stock then outstanding after giving effect to such exercise.
Number of warrants exercised	99,500	0
Proceeds from exercise of warrants	$ 199,000
Weighted average exercise price	$ 2.00

Stockholders' Equity (Detail Textuals 4) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Jul. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Series A Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued	8,872	264	0
Number of shares issued upon conversion		8,608
Number of shares converted		4,304,000
Price per share used to determine number of shares of common stock	$ 1,000
Conversion price of convertible preferred stock	$ 2.00
Percentage of blocker provision	4.99%
Conversion percentage	9.99%
Condition related to events occurrence for conversion of preferred stock		(i) the volume weighted average price of our common stock for 30 consecutive trading days (the "Measurement Period") exceeds 300% of the initial conversion price of the Series A Preferred Stock (subject to adjustment for forward and reverse stock splits, recapitalizations, stock dividends and similar transactions), (ii) the daily trading volume on each Trading Day during such Measurement Period exceeds $500,000 per trading day and (iii) the holder is not in possession of any information that constitutes or might constitute, material non-public information which was provided by the Company.
Preferred stock, shares outstanding		264	0
6% Convertible Exchangeable preferred stock
Class of Stock [Line Items]
Preferred stock, shares issued		335,273	335,273
Preferred stock, shares outstanding		335,273	335,273
Dividend rate on convertible exchangeable preferred stock (in percent)		6.00%
Share issue price per share		$ 10.00
Liquidation preference (in dollars per share)		$ 10.00
Accrued and unpaid dividends in arrears on preferred stock		$ 0.7	$ 0.7
Accrued and unpaid dividends in arrears on preferred stock (in dollars per share)		$ 1.95	$ 1.95
Shares reserved for future issuance upon conversion			1,698
Number of shares to be issued for each preferred stock upon conversion		0.00507
Conversion price (in dollars per share)		$ 1,974
Share Price		$ 2,961
Percentage of closing sales price of common stock that conversion price must exceed in order for preferred stock to be convertible		150.00%
Number of trading days within 30 trading days in which the closing price of common stock must exceed conversion price for preferred stock to be convertible		20 days
Number of trading days during which closing price of common stock must exceed conversion price for at least 20 days in order for the preferred stock to be convertible		30 days
Number of trading days prior to notice of automatic conversion		5 days
Redemption price per share (in dollars per share)		$ 10.00
Interest rate of Convertible Subordinated Debentures (as a percent)		6.00%
Debt principal amount per share, basis for exchange (in dollars per share)		$ 10.00
Debt instrument, term		25 years
Preferred stock dividend declared, amount per share		$ 0.15

Stock-Based Compensation Arrangements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Stock-based compensation
Stock-based compensation costs before income taxes	$ 266	$ 782
Research and development
Stock-based compensation
Stock-based compensation costs before income taxes	72	305
General and administrative
Stock-based compensation
Stock-based compensation costs before income taxes	$ 194	$ 477

Stock-Based Compensation Arrangements (Details 1) - Stock options - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Number of Options Outstanding
Options outstanding at the beginning of the period (in shares)	389,379	206,298
Granted (in shares)	170,853	197,841
Exercised (in shares)	0	0
Cancelled / forfeited (in shares)	(24,615)	(14,760)
Options outstanding at the end of the period (in shares)	535,617	389,379	206,298
Unvested at December 31, 2017	386,682
Vested and exercisable at December 31, 2017	148,755
Weighted Average Exercise Price Per Share
Options outstanding at the beginning of the period (in dollars per share)	$ 25.80	$ 72.60
Granted (in dollars per share)	1.93	4.68
Cancelled / forfeited (in dollars per share)	179.92	396.83
Options outstanding at the end of the period (in dollars per share)	11.10	$ 25.80	$ 72.60
Unvested at the end of the period (in dollars per share)	3.64
Vested and exercisable at the end of the period (in dollars per share)	$ 30.49
Weighted Average Remaining Contractual Term (Years)
Options outstanding	8 years 2 months 23 days	5 years 9 months 29 days	8 years 1 month 2 days
Unvested at the end of the period	8 years 10 months 2 days
Vested and exercisable at the end of the period	6 years 7 months 24 days
Aggregate Intrinsic Value
Options outstanding		$ 121

Stock-Based Compensation Arrangements (Details 2) - Stock options - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Fair value of the stock options granted calculated using Black-Scholes option-pricing model assumptions
Expected term	6 years
Volatility (as a percent)	108.00%
Expected dividend yield over expected term (as a percent)	0.00%	0.00%
Resulting weighted average grant fair value (in dollars per share)	$ 1.59	$ 3.66
Minimum
Fair value of the stock options granted calculated using Black-Scholes option-pricing model assumptions
Expected term		5 years
Risk free interest rate (as a percent)	1.89%	1.37%
Volatility (as a percent)		98.00%
Maximum
Fair value of the stock options granted calculated using Black-Scholes option-pricing model assumptions
Expected term		6 years
Risk free interest rate (as a percent)	2.265%	1.50%
Volatility (as a percent)		104.00%

Stock-Based Compensation Arrangements (Detail Textuals) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	May 22, 2015	Dec. 31, 2017	Dec. 31, 2016
Stock options
Stock-based compensation
Number of options granted		170,853	197,841
Weighted average grant-date fair value (in dollars per share)		$ 1.59	$ 3.66
Fair value assumptions method used		Black-Scholes option-pricing model
Percentage of vesting of awards		25.00%
Performance Based Options
Stock-based compensation
Number of options granted		158,853
2015 Plan \| Stock options
Stock-based compensation
Number of shares reserved	458,753
Maximum life of stock option awards granted	10 years
2015 Plan \| Stock options \| Minimum
Stock-based compensation
Vesting period	1 year
2015 Plan \| Stock options \| Maximum
Stock-based compensation
Vesting period	4 years
2015 Plan \| Stock options \| Employees and directors
Stock-based compensation
Number of options granted			197,841
Grant date fair value			$ 0.7
Remaining unrecognized compensation cost of non-vested stock options		$ 0.2
Weighted-average remaining requisite service period of recognition of unrecognized compensation cost		10 months 24 days
2015 Plan \| Performance Based Options \| Employees and directors
Stock-based compensation
Number of options granted			189,091

Employee Benefit Plans (Detail Textuals) - USD ($)	12 Months Ended
Employee Benefit Plans (Detail Textuals) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Pension Plan
Employee benefit plans
Contribution made by the entity under the pension plan	$ 54,000	$ 57,000
401 (k) Plan
Employee benefit plans
Matching contribution by employer as a percentage of the employee's deferral	100.00%
Matching contribution by employer as a percentage of U.S. employee's qualifying compensation	6.00%
Statutorily prescribed annual limit of contributions made by an employee before attaining age of 50 years	$ 18,000
Statutorily prescribed annual limit of contributions made by an employee after attaining age of 50 years	$ 24,000
Specified age limit of employees for calculation of statutorily prescribed annual limit of contribution	50 years
Contribution made by the entity under the 401(k) Plan	$ 28,000	$ 32,000

Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Loss (income) from continuing operations before taxes
Domestic	$ (127)	$ (2,011)
Foreign	(8,336)	(11,763)
Loss from continuing operations before taxes	$ (8,463)	$ (13,774)

Taxes (Details 1) - USD ($) $ in Thousands	12 Months Ended
Taxes (Details 1) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Benefit for income taxes from continuing operations
Current - domestic	$ 0	$ 0
Current - foreign	993	1,983
Current - total	993	1,983
Deferred - domestic	0	0
Income tax benefit, total	$ 993	$ 1,983

Taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
Taxes (Details 2) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of the (benefit) provision for income taxes
Loss from continuing operations before taxes	$ (8,463)	$ (13,774)
Income tax expense computed at statutory federal tax rate	(2,877)	(4,683)
Disallowed expenses and non-taxable income	3	12
Loss surrendered to generate R&D credit	856	1,945
Additional research and development tax relief	(1,262)	(2,827)
Change in valuation allowance	(4,487)	2,029
Foreign items, including change in tax rates, and other	1,901	1,238
Change in US Tax Rate	4,112	0
Other foreign items	761	303
Income tax benefit, total	$ (993)	$ (1,983)

Taxes (Details 3) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Net operating loss and tax credit carryforwards
Net operating loss and tax credit carryforwards	$ 38,948	$ 42,851
Depreciation, amortization and impairment of property and equipment	111	137
Stock options	1,807	2,365
Research and development credits	4,021	4,021
Other	0	0
Deferred tax assets	44,887	49,374
Valuation allowance for deferred tax assets	(44,887)	(49,374)
Net deferred tax assets	$ 0	$ 0

Taxes (Detail Textuals) - USD ($) $ in Thousands	12 Months Ended
Taxes (Detail Textuals) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Taxes
US corporate income tax rate	34.00%	34.00%
Corporate income tax rate	21.00%
Valuation allowance for deferred tax assets	$ 44,887	$ 49,374
Reduction in deferred tax assets	$ 4,100
Use of these NOLs restricted to an annual allowance	<div><font style="font-family: times new roman,times;" size="2">use of these NOLs is restricted to an annual £5 million allowance in each standalone company or group and above this allowance, there will be a 50% restriction in the profits that can be covered by losses brought forward</font></div>
Maximum
Taxes
US corporate income tax rate	35.00%
Federal
Taxes
NOLs carryforward	$ 28,400	28,400
United Kingdom
Taxes
Income tax credits	4,000
NOLs carryforward	$ 186,200	178,200
Percentage of tax rate adopted in respect of deferred tax assets measurement	17.00%
Research and development \| United Kingdom
Taxes
Income tax credits	$ 1,000	$ 2,000

Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net loss	$ (7,470)	$ (11,791)
Dividend on convertible exchangeable preferred shares	201	200
Beneficial conversion feature of Series A convertible stock	3,638	0
Conversion of Series A convertible preferred stock	3,537	0
Net loss attributable to common shareholders	$ (14,846)	$ (11,991)
Denominator:
Weighted average common shares outstanding (in shares)	7,631,152	3,424,976
Loss per share - basic and diluted (in dollars per share)	$ (1.95)	$ (3.50)

Net Loss Per Share (Details 1) - shares	12 Months Ended
Net Loss Per Share (Details 1) - shares	Dec. 31, 2017	Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total shares excluded from calculation	8,159,814	391,076
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total shares excluded from calculation	535,616	389,378
Convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total shares excluded from calculation	1,698	1,698
Series A Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total shares excluded from calculation	132,000	0
Common stock warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total shares excluded from calculation	7,490,500	0

Geographic Information (Details) - USD ($) $ in Thousands	12 Months Ended
Geographic Information (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 0	$ 843
Net loss	(7,470)	(11,791)
Assets	26,003	19,662
Long Lived Assets, net	29	45
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	0	843
Net loss	(7,343)	(9,580)
Assets	2,481	4,465
Long Lived Assets, net	29	43
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net loss	(127)	(2,211)
Assets	23,522	15,197
Long Lived Assets, net	$ 0	$ 2

Subsequent Events (Detail Textuals) - Subsequent event - Board of Directors	Mar. 07, 2018 $ / shares
Subsequent Event [Line Items]
Preferred stock dividend declared, amount per share	$ 0.15
Dividend declared, date	Mar. 07, 2018
Dividend paid, date	May 01, 2018
Dividend, record date	Apr. 11, 2018