CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenues:
Grant revenue	$ 512us-gaap_RevenueFromGrants	$ 396us-gaap_RevenueFromGrants
Total revenues	512us-gaap_SalesRevenueNet	396us-gaap_SalesRevenueNet
Operating expenses:
Research and development	4,342us-gaap_ResearchAndDevelopmentExpense	4,344us-gaap_ResearchAndDevelopmentExpense
General and administrative	1,468	1,462
Total operating expenses	5,810us-gaap_CostsAndExpenses	5,806us-gaap_CostsAndExpenses
Operating loss	(5,298)us-gaap_OperatingIncomeLoss	(5,410)us-gaap_OperatingIncomeLoss
Other income (expense):
Change in valuation of financial instruments associated with stock purchase agreement	(20)	(47)
Foreign exchange gains (losses)	(378)	10
Interest income	1us-gaap_InvestmentIncomeInterest	1us-gaap_InvestmentIncomeInterest
Other income, net	20us-gaap_OtherNonoperatingIncome
Total other (expense), net	(377)us-gaap_NonoperatingIncomeExpense	(36)us-gaap_NonoperatingIncomeExpense
Loss from continuing operations before taxes	(5,675)	(5,446)
Income tax benefit	763us-gaap_IncomeTaxExpenseBenefit	569us-gaap_IncomeTaxExpenseBenefit
Net loss from continuing operations	(4,912)	(4,877)
Discontinued operations:
Income from discontinued operations		13
Income tax on discontinued operations		(5)
Net income from discontinued operations		8
Net loss	(4,912)us-gaap_NetIncomeLoss	(4,869)us-gaap_NetIncomeLoss
Dividend on convertible exchangeable preferred shares	(50)cycc_DividendsPreferredStocks	(50)cycc_DividendsPreferredStocks
Net loss applicable to common shareholders	$ (4,962)	$ (4,919)
Basic and diluted earnings per common share:
Net loss per share, continuing operations - basic and diluted (in dollars per share)	$ (0.19)	$ (0.25)
Net income per share, discontinued operations - basic and diluted (in dollars per share)	$ 0.00	$ 0.00
Net loss per share - basic and diluted (in dollars per share)	$ (0.19)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.25)us-gaap_EarningsPerShareBasicAndDiluted
Weighted average common shares outstanding (in shares)	26,067,078	19,530,322

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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