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v2.4.1.9

Financing Arrangements (Narrative) (Details) (USD $) | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2014 | Mar. 31, 2015 | Dec. 31, 2014 | Jul. 31, 2014 | Aug. 12, 2014
Debt Instrument [Line Items] |  |  |  |  |
Additional final payment on borrowings (percent) |  |  |  | 6.00%lgnd_LineOfCreditFacilityAdditionalPaymentOnBorrowingsPercentage |
Initial debt value |  | $ 198,219,000 us-gaap_ConvertibleDebtNoncurrent | $ 195,908,000 us-gaap_ConvertibleDebtNoncurrent |  |
Long-term debt issuance costs |  | 3,177,000 us-gaap_UnamortizedDebtIssuanceExpense | 3,388,000 us-gaap_UnamortizedDebtIssuanceExpense |  |
Common stock, shares available to be issued | 3,264,643 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  |  |  |
Exercise price of convertible bond hedge | $ 75.05 lgnd_ExercisePriceofConvertibleBondHedge |  |  |  |
Exercise price | $ 125.08 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |  |  |  |
Proceeds from issuance of warrants | 11,600,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued |  |  |  |
Current notes payable |  | 348,000 us-gaap_NotesPayableCurrent | 334,000 us-gaap_NotesPayableCurrent |  |
Common Stock |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Share price |  |  |  |  | $ 55.59 us-gaap_SharePrice / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember
2019 convertible senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Aggregate principal amount outstanding |  | 245,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember | 245,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember |  |
Initial debt value |  | 198,219,000 us-gaap_ConvertibleDebtNoncurrent / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember | 195,908,000 us-gaap_ConvertibleDebtNoncurrent / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember |  |
Convertible notes payable, Viking Therapeutics, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate |  | 2.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember |  |  |
Term of notes | 2 years |  |  |  |
Current notes payable |  | 348,000 us-gaap_NotesPayableCurrent / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember | 334,000 us-gaap_NotesPayableCurrent / us-gaap_DebtInstrumentAxis = us-gaap_ConvertibleNotesPayableMember |  |
Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Payment for convertible bond hedges | 48,100,000 lgnd_PaymentsforConvertibleBondHedges / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Senior Notes | 2019 convertible senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate | 0.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Aggregate principal amount outstanding | 245,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Net proceeds from note after debt issuance costs | 239,300,000 us-gaap_ProceedsFromDebtNetOfIssuanceCosts / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Initial conversion rate | 0.0133251 us-gaap_DebtInstrumentConvertibleConversionRatio1 / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Initial conversion price | $ 75.05 us-gaap_DebtInstrumentConvertibleConversionPrice1 / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Premium percentage | 35.00%lgnd_DebtInstrumentPremiumPercentageofConversionPrice / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Proceeds from issuance of debt | 245,000,000 us-gaap_ProceedsFromIssuanceOfDebt / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Debt discount rate | 5.83%us-gaap_FairValueInputsDiscountRate / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Initial debt value | 192,500,000 us-gaap_ConvertibleDebtNoncurrent / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Debt issuance costs | 5,700,000 us-gaap_DebtIssuanceCosts / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Equity component of convertible debt recorded as a reduction to additional paid-in capital | 1,200,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Long-term debt issuance costs | 4,500,000 us-gaap_UnamortizedDebtIssuanceExpense / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Term of notes | 5 years |  |  |  |
Carrying value of the equity component of debt, net of issuance costs |  | $ 51,300,000 us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | $ 51,300,000 us-gaap_DebtInstrumentConvertibleCarryingAmountOfTheEquityComponent / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |
Senior Notes | 2019 convertible senior notes | Debt Instrument, Redemption, Period One |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Threshold trading days | 20 us-gaap_DebtInstrumentConvertibleThresholdTradingDays / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Consecutive trading days | 30 days |  |  |  |
Percentage of stock price trigger | 130.00%us-gaap_DebtInstrumentConvertibleThresholdPercentageOfStockPriceTrigger / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodOneMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Senior Notes | 2019 convertible senior notes | Debt Instrument, Redemption, Period Two |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Threshold trading days | 5 us-gaap_DebtInstrumentConvertibleThresholdTradingDays / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Consecutive trading days | 10 days |  |  |  |
Maximum threshold percentage of debt trading price trigger | 98.00%lgnd_DebtInstrumentConvertibleMaximumThresholdPercentageofDebtTradingPriceTrigger / us-gaap_DebtInstrumentAxis = lgnd_A2019ConvertibleSeniorNotesMember / us-gaap_DebtInstrumentRedemptionPeriodAxis = us-gaap_DebtInstrumentRedemptionPeriodTwoMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |

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