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Avinza Co-Promotion (Co-Promote Termination Liability) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Summary of co-promote termination liability |
Net present value of payments based on estimated future net Avinza product sales | $ 322 lgnd_CoPromotionAgreementTerminationLiability
Assumed payments made by Pfizer or assignee | (297)lgnd_CoPromotionAgreementTerminationAssumedPaymentsMadeByAssignee
Fair value adjustments | 63 lgnd_CoPromotionAgreementTerminationFairValueAdjustments
Total co-promote termination liability | $ 88 lgnd_CoPromotionAgreementTerminationLiability

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- Details
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Namespace Prefix: | lgnd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Co-promotion agreement termination assumed payments made by assignee. + References No definition available. + Details
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Namespace Prefix: | lgnd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Co-promotion agreement, termination, fair value adjustments. + References No definition available. + Details
Name: | lgnd_CoPromotionAgreementTerminationFairValueAdjustments
Namespace Prefix: | lgnd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Co-promotion agreement, termination liability. + References No definition available. + Details
Name: | lgnd_CoPromotionAgreementTerminationLiability
Namespace Prefix: | lgnd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant