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Avinza Co-Promotion (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Summary of co-promote termination liability    
Total co-promote termination liability at beginning of period $ 11,746lgnd_CoPromotionAgreementTerminationLiability $ 12,534lgnd_CoPromotionAgreementTerminationLiability
Assumed payments made by Pfizer or assignee (1,243)lgnd_CoPromotionAgreementTerminationAssumedPaymentsMadeByAssignee (3,310)lgnd_CoPromotionAgreementTerminationAssumedPaymentsMadeByAssignee
Fair value adjustments due to passage of time (10,181)lgnd_CoPromotionAgreementTerminationFairValueAdjustments 2,522lgnd_CoPromotionAgreementTerminationFairValueAdjustments
Total co-promote termination liability at end of period $ 322lgnd_CoPromotionAgreementTerminationLiability $ 11,746lgnd_CoPromotionAgreementTerminationLiability