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Significant Contracts (Detail textuals) (Daiichi Sankyo, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Daiichi Sankyo
Loss Contingencies [Line Items]
Future milestone payments payable	$ 10cycc_LicenseAgreementPotentialFutureMilestonePayments / dei_LegalEntityAxis = cycc_DaiichiSankyoCompanyLimitedMember
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

X

- Definition

Represents the notice period for the termination of license after a launch of a sapacitabine-based product, or by either party for material default.

+ References

No definition available.

+ Details

Name:	cycc_LicenseAgreementNoticePeriodForTerminationOfAgreementAfterLaunchOfSapacitabineBasedProductOrInCaseOfMaterialDefault
Namespace Prefix:	cycc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the period for which royalties will be paid following the first commercial sale of licensed products in the country.

+ References

No definition available.

+ Details

Name:	cycc_LicenseAgreementPeriodForRoyaltiesPaymentAfterFirstCommercialSaleOfLicensedProductsInCountry
Namespace Prefix:	cycc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The potential future milestone payments required to be made under certain contractual agreements.

+ References

No definition available.

+ Details

Name:	cycc_LicenseAgreementPotentialFutureMilestonePayments
Namespace Prefix:	cycc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the notice period for the termination of license by the reporting entity for technical, scientific, efficacy, safety, or commercial reasons.

+ References

No definition available.

+ Details

Name:	cycc_LicensingAgreementNoticePeriodForTerminationOfAgreementDueToTechnicalScientificEfficacySafetyOrCommercialReason
Namespace Prefix:	cycc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration