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Fair Value Measurements (Acquisition of CyDex) (Details) (Cydex Pharmaceuticals, Inc, USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Credit Derivatives [Line Items] |  |
Amount Of Revenue For Contingent Consideration | 15 lgnd_AmountOfRevenueForContingentConsideration |
Contingent Consideration Classified as Equity |  |
Credit Derivatives [Line Items] |  |
Revenue volatility | 25.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_ContingentConsiderationClassifiedAsEquityMember | 25.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_ContingentConsiderationClassifiedAsEquityMember
Average of probability of commercialization | 77.00%lgnd_FairValueInputsAverageOfProbabilityOfCommercialization / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_ContingentConsiderationClassifiedAsEquityMember | 81.00%lgnd_FairValueInputsAverageOfProbabilityOfCommercialization / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_ContingentConsiderationClassifiedAsEquityMember
Sales beta | 0.70 lgnd_FairValueInputsSalesBeta / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_ContingentConsiderationClassifiedAsEquityMember | 0.60 lgnd_FairValueInputsSalesBeta / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_ContingentConsiderationClassifiedAsEquityMember
Credit rating | B | B
Equity risk premium | 6.00%us-gaap_FairValueInputsControlPremium / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_ContingentConsiderationClassifiedAsEquityMember | 6.00%us-gaap_FairValueInputsControlPremium / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_ContingentConsiderationClassifiedAsEquityMember
Minimum | Contingent Consideration Classified as Equity |  |
Credit Derivatives [Line Items] |  |
Range of annual revenue subject to revenue sharing | 17.7 lgnd_FairValueInputsAnnualRevenueSubjectToRevenueSharing / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_ContingentConsiderationClassifiedAsEquityMember / us-gaap_RangeAxis = us-gaap_MinimumMember | 17.2 lgnd_FairValueInputsAnnualRevenueSubjectToRevenueSharing / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_ContingentConsiderationClassifiedAsEquityMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum | Contingent Consideration Classified as Equity |  |
Credit Derivatives [Line Items] |  |
Range of annual revenue subject to revenue sharing | 21.6 lgnd_FairValueInputsAnnualRevenueSubjectToRevenueSharing / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_ContingentConsiderationClassifiedAsEquityMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 17.3 lgnd_FairValueInputsAnnualRevenueSubjectToRevenueSharing / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember / us-gaap_FairValueByLiabilityClassAxis = us-gaap_ContingentConsiderationClassifiedAsEquityMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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