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Balance Sheet Components - Deferred Revenue (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Deferred Revenue Arrangement [Line Items]    
Deferred revenue - current portion $ 18,797us-gaap_DeferredRevenueCurrent $ 18,773us-gaap_DeferredRevenueCurrent
Deferred revenue related to the Agreement (see Note 3) 32,757us-gaap_DeferredRevenueNoncurrent 34,885us-gaap_DeferredRevenueNoncurrent
Janssen [Member]    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue - current portion 11,172us-gaap_DeferredRevenueCurrent
/ dei_LegalEntityAxis
= pcyc_JanssenMember		 11,656us-gaap_DeferredRevenueCurrent
/ dei_LegalEntityAxis
= pcyc_JanssenMember
Deferred revenue related to the Agreement (see Note 3) 32,757us-gaap_DeferredRevenueNoncurrent
/ dei_LegalEntityAxis
= pcyc_JanssenMember		 34,885us-gaap_DeferredRevenueNoncurrent
/ dei_LegalEntityAxis
= pcyc_JanssenMember
Collaboration and License Agreement with Janssen Biotech Inc [Member]    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue - current portion $ 7,625us-gaap_DeferredRevenueCurrent
/ dei_LegalEntityAxis
= pcyc_CollaborationAndLicenseAgreementWithJanssenBiotechIncMember		 $ 7,117us-gaap_DeferredRevenueCurrent
/ dei_LegalEntityAxis
= pcyc_CollaborationAndLicenseAgreementWithJanssenBiotechIncMember