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Basis of Presentation (Details 3) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Summary of Goodwill and Other Identifiable Intangible Assets |  |
Goodwill | $ 12,238us-gaap_Goodwill | $ 12,238us-gaap_Goodwill
Total goodwill and other identifiable intangible assets, net | 62,961us-gaap_IntangibleAssetsNetIncludingGoodwill | 65,337us-gaap_IntangibleAssetsNetIncludingGoodwill
Complete technology |  |
Summary of Goodwill and Other Identifiable Intangible Assets |  |
Definite lived intangible assets | 15,267us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentedTechnologyMember | 15,267us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentedTechnologyMember
Less: Accumulated amortization | (2,999)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentedTechnologyMember | (2,235)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_PatentedTechnologyMember
Trade name |  |
Summary of Goodwill and Other Identifiable Intangible Assets |  |
Definite lived intangible assets | 2,642us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | 2,642us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Less: Accumulated amortization | (519)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | (387)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember
Customer relationships |  |
Summary of Goodwill and Other Identifiable Intangible Assets |  |
Definite lived intangible assets | 29,600us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | 29,600us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Less: Accumulated amortization | (5,824)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember | (4,344)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember
Acquired in-process research and development |  |
Summary of Goodwill and Other Identifiable Intangible Assets |  |
Acquired in-process research and development | $ 12,556us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = lgnd_AcquiredInProcessResearchAndDevelopmentMember | $ 12,556us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = lgnd_AcquiredInProcessResearchAndDevelopmentMember

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