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Balance Sheet Account Details - Contingent Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Contingent Liability |  |
Commercial rights, beginning of period | $ 3,198 | $ 3,513
Payments | (200) | (50)
Fair Value Adjustment | 683 | (265)
Commercial rights, end of period | 3,681 | 3,198
Cydex |  |
Contingent Liability |  |
Commercial rights, beginning of period | 320 | 84
Payments | (200) | (50)
Fair Value Adjustment | 263 | 286
Commercial rights, end of period | 383 | 320
Metabasis |  |
Contingent Liability |  |
Commercial rights, beginning of period | 2,878 | 3,429
Payments | 0 | 0
Fair Value Adjustment | 420 | (551)
Commercial rights, end of period | $ 3,298 | $ 2,878

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- Definition Business Acquisition Contingent Consideration Potential Cash Payment at End of Period + References No definition available. + Details
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Namespace Prefix: | lgnd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contingent Liability [Roll Forward] + References No definition available. + Details
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Namespace Prefix: | lgnd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
Name: | lgnd_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityFairValueAdjustmentContingentLiabilities
Namespace Prefix: | lgnd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Payments to contingent value right holders + References No definition available. + Details
Name: | lgnd_PaymentsToContingentValueRightHolders
Namespace Prefix: | lgnd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=lgnd_CydexPharmaceuticalsIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=lgnd_MetabasisTherapeuticsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |