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Taxes (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of the (benefit) provision for income taxes
Loss from continuing operations before taxes	$ (22,649)cycc_IncomeLossFromContinuingAndDiscontinuedOperationsBeforeIncomeTaxes	$ (11,880)cycc_IncomeLossFromContinuingAndDiscontinuedOperationsBeforeIncomeTaxes
Income tax expense computed at statutory federal tax rate	(7,701)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	(4,039)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Disallowed expenses and non-taxable income	406cycc_IncomeTaxReconciliationNondeductibleExpenseAndTaxExemptIncome	62cycc_IncomeTaxReconciliationNondeductibleExpenseAndTaxExemptIncome
Loss surrendered to generate R&D credit	7,294us-gaap_IncomeTaxReconciliationNondeductibleExpenseResearchAndDevelopment	4,833us-gaap_IncomeTaxReconciliationNondeductibleExpenseResearchAndDevelopment
Additional research and development tax relief	(7,262)us-gaap_IncomeTaxReconciliationOtherAdjustments	(4,418)us-gaap_IncomeTaxReconciliationOtherAdjustments
Change in valuation allowance	(4,963)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	6,302us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Research and development credit - prior years		(4,530)cycc_ResearchAndDevelopmentTrueUp
Foreign items, including change in tax rates, and other	3,555us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate	120us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Other foreign items	5,428us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Current - total	$ (3,243)us-gaap_IncomeTaxExpenseBenefit	$ (1,670)us-gaap_IncomeTaxExpenseBenefit

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Represents the total earnings or loss from continuing operations and discontinued operations before income taxes.

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The sum of the differences between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to nondeductible expenses under enacted tax laws, differences in the methodologies used to determine expense amounts for financial statements prepared in accordance with generally accepted accounting principles and income that is exempt from income taxes under enacted tax laws.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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