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Fair Value Measurement (Details 2) (USD $) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Aug. 31, 2014
Assets: |  |  |
Fair value of level 3 financial instruments as of December 31, 2013 | $ 11,746,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue |  |
Assumed payments made by Pfizer or assignee | (1,243,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements |  |
Fair value adjustments to co-promote termination liability | (10,181,000)lgnd_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetFairValueAdjustment |  |
Fair value of level 3 financial instrument assets as of December 31, 2014 | 322,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue |  |
Liabilities |  |  |
Fair value of level 3 financial instruments as of December 31, 2013 | 21,057,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue |  |
Assumed payments made by Pfizer or assignee | (1,243,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements |  |
Payments to CVR holders and other contingency payments | (3,493,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases |  |
Fair value adjustments to contingent liabilities | 5,679,000lgnd_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityFairValueAdjustmentContingentLiabilities |  |
Fair value adjustments to co-promote termination liability | (10,181,000)lgnd_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityFairValueAdjustmentCoPromotionTermination |  |
Fair value of level 3 financial instruments as of December 31, 2014 | 11,819,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue |  |
2019 Convertible Senior Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Principal amount outstanding | 245,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember | 0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember |
Fair value of convertible debt | 239,200,000us-gaap_ConvertibleDebtFairValueDisclosures / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember |  |
2019 Convertible Senior Notes | Senior Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Principal amount outstanding | $ 245,000,000.0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | $ 245,000,000.0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Fair Value Adjustment + References No definition available. + Details
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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Fair Value Adjustment, Contingent Liabilities + References No definition available. + Details
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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Fair Value Adjustment, Co-Promotion Termination + References No definition available. + Details
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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Convertible Security -URI http://asc.fasb.org/extlink&oid=6509036 + Details
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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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