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Basis of Presentation (Details Textual) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended |  |  |  |
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Sep. 30, 2014 | Dec. 31, 2014 segment | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 31, 2012 | Jan. 31, 2010 right | Apr. 30, 2013 program | Jan. 31, 2011 | Dec. 31, 2009 right | Aug. 31, 2014
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations | $ 6,730,000us-gaap_IncomeLossFromContinuingOperations | $ 777,000us-gaap_IncomeLossFromContinuingOperations | $ 1,288,000us-gaap_IncomeLossFromContinuingOperations | $ 2,097,000us-gaap_IncomeLossFromContinuingOperations | $ 1,869,000us-gaap_IncomeLossFromContinuingOperations | $ 1,965,000us-gaap_IncomeLossFromContinuingOperations | $ 3,694,000us-gaap_IncomeLossFromContinuingOperations | $ 1,304,000us-gaap_IncomeLossFromContinuingOperations |  | $ 12,024,000us-gaap_IncomeLossFromContinuingOperations | $ 8,832,000us-gaap_IncomeLossFromContinuingOperations | $ (2,674,000)us-gaap_IncomeLossFromContinuingOperations |  |  |  |  |  |
Accumulated deficit | (659,315,000)us-gaap_RetainedEarningsAccumulatedDeficit |  |  |  | (671,339,000)us-gaap_RetainedEarningsAccumulatedDeficit |  |  |  |  | (659,315,000)us-gaap_RetainedEarningsAccumulatedDeficit | (671,339,000)us-gaap_RetainedEarningsAccumulatedDeficit |  |  |  |  |  |  |
Working capital | 162,400,000lgnd_WorkingCapital |  |  |  |  |  |  |  |  | 162,400,000lgnd_WorkingCapital |  |  |  |  |  |  |  |
Common shares excluded from computation |  |  |  |  |  |  |  |  |  | 5,100,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 800,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 1,100,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  |  |  |  |  |
Maturity period of cash and cash equivalents, maximum |  |  |  |  |  |  |  |  |  | 3 months |  |  |  |  |  |  |  |
FDIC insured amount | 250,000us-gaap_CashFDICInsuredAmount |  |  |  |  |  |  |  |  | 250,000us-gaap_CashFDICInsuredAmount |  |  |  |  |  |  |  |
Cash deposits | 91,700,000lgnd_CashDepositsInExcessOfFdicInsuredAmount |  |  |  |  |  |  |  |  | 91,700,000lgnd_CashDepositsInExcessOfFdicInsuredAmount |  |  |  |  |  |  |  |
Reserve for obsolete inventory | 0us-gaap_InventoryValuationReserves |  |  |  | 0us-gaap_InventoryValuationReserves |  |  |  |  | 0us-gaap_InventoryValuationReserves | 0us-gaap_InventoryValuationReserves |  |  |  |  |  |  |
Accounts receivable outstanding considered past due after period, minimum |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |
Accounts receivable outstanding considered past due after period, maximum |  |  |  |  |  |  |  |  |  | 90 days |  |  |  |  |  |  |  |
Allowance for doubtful accounts | 0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |  |  |  | 0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |  |  |  |  | 0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent | 0us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  | 300,000us-gaap_Depreciation | 300,000us-gaap_Depreciation | 300,000us-gaap_Depreciation |  |  |  |  |  |
Definite lived intangibles, useful life |  |  |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  |  |  |  |  |  | 2,400,000us-gaap_AmortizationOfIntangibleAssets | 2,400,000us-gaap_AmortizationOfIntangibleAssets | 2,400,000us-gaap_AmortizationOfIntangibleAssets |  |  |  |  |  |
Estimated amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense next year | 2,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |  |  |  |  |  |  |  | 2,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |  |  |  |  |  |  |
Amortization expense year two | 2,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |  |  |  |  |  |  |  | 2,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |  |  |  |  |  |  |
Amortization expense year three | 2,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |  |  |  |  |  |  |  | 2,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |  |  |  |  |  |  |
Amortization expense year four | 2,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |  |  |  |  |  |  |  | 2,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |  |  |  |  |  |  |
Amortization expense year five | 2,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |  |  |  |  |  |  |  | 2,400,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |  |  |  |  |  |  |
Goodwill | 12,238,000us-gaap_Goodwill |  |  |  | 12,238,000us-gaap_Goodwill |  |  |  |  | 12,238,000us-gaap_Goodwill | 12,238,000us-gaap_Goodwill |  |  |  |  |  |  |
(Gain) loss on asset disposal |  |  |  |  |  |  |  |  |  | (16,000)us-gaap_AssetImpairmentCharges | 5,000us-gaap_AssetImpairmentCharges | (17,000)us-gaap_AssetImpairmentCharges |  |  |  |  |  |
Number of commercial license agreement programs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15lgnd_LicenseAgreementNumberOfCommericalLicenseAgreementPrograms |  |  |
Paid to CyDex shareholders |  |  |  |  |  |  |  |  |  | 1,000,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 3,571,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |  |  |  |  |
Retirement of treasury shares (in shares) |  |  |  |  |  |  |  |  |  |  | 1,118,222us-gaap_TreasuryStockSharesRetired |  |  |  |  |  |  |
Period allowed for return of products, minimum |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |
Period allowed for return of products, maximum |  |  |  |  |  |  |  |  | 90 days |  |  |  |  |  |  |  |  |
Restocking fee (percent) |  |  |  |  |  |  |  |  |  | 20.00%lgnd_SalesReturnsRestockingFeePercent |  |  |  |  |  |  |  |
Deferred revenue | 0us-gaap_DeferredRevenue |  |  |  | 100,000us-gaap_DeferredRevenue |  |  |  |  | 0us-gaap_DeferredRevenue | 100,000us-gaap_DeferredRevenue |  |  |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments |  |  |  |  |  |  |  |  |  | 2us-gaap_NumberOfReportableSegments |  |  |  |  |  |  |  |
Total assets | 258,029,000us-gaap_Assets |  |  |  | 104,713,000us-gaap_Assets |  |  |  |  | 258,029,000us-gaap_Assets | 104,713,000us-gaap_Assets |  |  |  |  |  |  |
Total liabilities | 233,621,000us-gaap_Liabilities |  |  |  | 55,100,000us-gaap_Liabilities |  |  |  |  | 233,621,000us-gaap_Liabilities | 55,100,000us-gaap_Liabilities |  |  |  |  |  |  |
Stock Options | 2002 Stock Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award expiration period |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Stock Options | Vest 1/8 on the six month anniversary of the date of grant | 2002 Stock Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |
Award vesting right percentage |  |  |  |  |  |  |  |  |  | 12.50%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = lgnd_TwoThousandTwoStockIncentivePlanMember / us-gaap_VestingAxis = lgnd_VestingPeriodOneMember |  |  |  |  |  |  |  |
Stock Options | Vest 1/48 each month for forty-two months | 2002 Stock Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  |  | 42 months |  |  |  |  |  |  |  |
Award vesting right percentage |  |  |  |  |  |  |  |  |  | 2.08%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = lgnd_TwoThousandTwoStockIncentivePlanMember / us-gaap_VestingAxis = lgnd_VestingPeriodTwoMember |  |  |  |  |  |  |  |
Director | 2002 Stock Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales/revenues from partners reporting period |  |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales/revenues from partners reporting period |  |  |  |  |  |  |  |  |  | 60 days |  |  |  |  |  |  |  |
Equipment | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |
Equipment | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |
CyDex |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets with definite lives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember |  |
Business combination, weighted-average amortization period intangible assets |  |  |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |
In-process research and development |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,200,000lgnd_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInProcessResearchAndDevelopment / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,500,000us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember |  |
(Gain) loss on asset disposal |  |  |  |  |  |  |  |  |  | 0us-gaap_AssetImpairmentCharges / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember | 500,000us-gaap_AssetImpairmentCharges / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember |  |  |  |  |  |  |
Contingent value rights fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,600,000us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember |  |
Discounted to present value using a discount rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21.60%lgnd_ContingentLiabilityAccrualDiscountRate / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember |  |
Fair value of contingent liability | 11,500,000lgnd_BusinessAcquisitionContingentConsiderationPotentialCashPaymentAtEndOfPeriod / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember |  |  |  | 9,300,000lgnd_BusinessAcquisitionContingentConsiderationPotentialCashPaymentAtEndOfPeriod / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember |  |  |  |  | 11,500,000lgnd_BusinessAcquisitionContingentConsiderationPotentialCashPaymentAtEndOfPeriod / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember | 9,300,000lgnd_BusinessAcquisitionContingentConsiderationPotentialCashPaymentAtEndOfPeriod / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember |  |  |  |  |  |  |
Contingent liability change in amount |  |  |  |  |  |  |  |  |  | (5,700,000)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember | 600,000us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember | (3,400,000)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember |  |  |  |  |  |
Contingent liability, cash payment |  |  |  |  |  |  |  |  |  | 3,500,000lgnd_BusinessCombinationContingentConsiderationLiabilityCashPayment / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember | 1,000,000lgnd_BusinessCombinationContingentConsiderationLiabilityCashPayment / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember | 8,000,000lgnd_BusinessCombinationContingentConsiderationLiabilityCashPayment / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember |  |  |  |  |  |
CyDex | Guaranteed Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paid to CyDex shareholders |  |  |  |  |  |  |  |  |  |  |  |  | 4,300,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = lgnd_CydexPharmaceuticalsIncMember / us-gaap_ContingentConsiderationByTypeAxis = lgnd_GuaranteedPaymentMember |  |  |  |  |
Metabasis Therapeutics |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of contingent liability | 3,700,000lgnd_BusinessAcquisitionContingentConsiderationPotentialCashPaymentAtEndOfPeriod / us-gaap_BusinessAcquisitionAxis = lgnd_MetabasisTherapeuticsMember |  |  |  | 4,200,000lgnd_BusinessAcquisitionContingentConsiderationPotentialCashPaymentAtEndOfPeriod / us-gaap_BusinessAcquisitionAxis = lgnd_MetabasisTherapeuticsMember |  |  |  |  | 3,700,000lgnd_BusinessAcquisitionContingentConsiderationPotentialCashPaymentAtEndOfPeriod / us-gaap_BusinessAcquisitionAxis = lgnd_MetabasisTherapeuticsMember | 4,200,000lgnd_BusinessAcquisitionContingentConsiderationPotentialCashPaymentAtEndOfPeriod / us-gaap_BusinessAcquisitionAxis = lgnd_MetabasisTherapeuticsMember |  |  | 9,100,000lgnd_BusinessAcquisitionContingentConsiderationPotentialCashPaymentAtEndOfPeriod / us-gaap_BusinessAcquisitionAxis = lgnd_MetabasisTherapeuticsMember |  |  |  |
Contingent liability change in amount |  |  |  |  |  |  |  |  |  | 500,000us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = lgnd_MetabasisTherapeuticsMember | (4,200,000)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = lgnd_MetabasisTherapeuticsMember | 1,100,000us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = lgnd_MetabasisTherapeuticsMember |  |  |  |  |  |
Number of contingent value rights |  |  |  |  |  |  |  |  |  |  |  |  |  | 4lgnd_NumberOfContingentValueRightsIssued / us-gaap_BusinessAcquisitionAxis = lgnd_MetabasisTherapeuticsMember |  |  |  |
Number of contingent value rights per series of contingent value rights |  |  |  |  |  |  |  |  |  |  |  |  |  | 1lgnd_NumberOfContingentValueRightsPerSeriesOfContingentValueRights / us-gaap_BusinessAcquisitionAxis = lgnd_MetabasisTherapeuticsMember |  |  |  |
Number of series of contingent value rights issued per share |  |  |  |  |  |  |  |  |  |  |  |  |  | 4lgnd_NumberOfRespectiveSeriesOfContingentValueRightsIssuedForEachShare / us-gaap_BusinessAcquisitionAxis = lgnd_MetabasisTherapeuticsMember |  |  |  |
Entitlement to cash payments (duration) |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |  |  |
Royalty Stream and Milestone Payments Purchase Agreement with Selexis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,600,000lgnd_LicenseAgreementPurchasePriceNetofAcquisitionCosts / us-gaap_BusinessAcquisitionAxis = lgnd_RoyaltyStreamAndMilestonePaymentsPurchaseAgreementWithSelexisMember |  |  |
Neurogen Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of contingent liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,200,000lgnd_BusinessAcquisitionContingentConsiderationPotentialCashPaymentAtEndOfPeriod / us-gaap_BusinessAcquisitionAxis = lgnd_NeurogenCorporationMember |
Contingent liability change in amount |  |  |  |  |  |  |  |  |  |  |  | 500,000us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = lgnd_NeurogenCorporationMember |  |  |  |  |  |
Number of contingent value rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4lgnd_NumberOfContingentValueRightsIssued / us-gaap_BusinessAcquisitionAxis = lgnd_NeurogenCorporationMember |
Neurogen Corporation | VR1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability change in amount |  |  |  |  |  |  |  |  |  |  |  | 200,000us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = lgnd_NeurogenCorporationMember / us-gaap_ContingentConsiderationByTypeAxis = lgnd_ContingentValueRightsVr1Member |  |  |  |  |  |
Omthera Pharmaceuticals |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognition, milestone method |  |  |  |  |  |  |  |  |  | 1,000,000us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / dei_LegalEntityAxis = lgnd_OmtheraPharmaceuticalsMember |  |  |  |  |  |  |  |
Proceeds from collaborators |  |  |  |  |  |  |  |  |  | 500,000us-gaap_ProceedsFromCollaborators / dei_LegalEntityAxis = lgnd_OmtheraPharmaceuticalsMember |  |  |  |  |  |  |  |
Omthera Pharmaceuticals | Collaborative Arrangement, Product |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognition, milestone method |  |  |  |  |  |  |  |  |  | 400,000us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / dei_LegalEntityAxis = lgnd_OmtheraPharmaceuticalsMember / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementProductAgreementMember |  |  |  |  |  |  |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets | 3,043,000us-gaap_Assets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |  |  |  |  |  |  |  | 3,043,000us-gaap_Assets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |  |  |  |  |  |  |
Total liabilities | 4,953,000us-gaap_Liabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |  |  |  |  |  |  |  | 4,953,000us-gaap_Liabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |  |  |  |  |  |  |  |
2019 Convertible Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount outstanding | 245,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember |  |  |  | 0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember |  |  |  |  | 245,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember | 0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember |  |  |  |  |  |  |
2019 Convertible Senior Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated amortization expense [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  | 245,000,000.0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Interest on debt instrument (percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Inventories |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase commitment | $ 15,400,000us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted / us-gaap_SupplyCommitmentAxis = us-gaap_InventoriesMember |  |  |  |  |  |  |  |  | $ 15,400,000us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted / us-gaap_SupplyCommitmentAxis = us-gaap_InventoriesMember |  |  |  |  |  |  |  |
Major Customer 1 | Customer Concentration Risk | Accounts Receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis of Presentation [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk, number of customers |  |  |  |  |  |  |  |  |  | 2lgnd_ConcentrationRiskNumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = lgnd_MajorCustomer1Member | 2lgnd_ConcentrationRiskNumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = lgnd_MajorCustomer1Member |  |  |  |  |  |  |
Concentration risk, percentage of accounts receivable |  |  |  |  |  |  |  |  |  | 64.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = lgnd_MajorCustomer1Member | 75.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = lgnd_MajorCustomer1Member |  |  |  |  |  |  |

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