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Avinza Co-Promotion (Details Textual) | Dec. 31, 2013 | Nov. 30, 2017
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Co Promotion [Line Items] |  |
Percentage of net sales payable as royalty | 6.50%lgnd_PercentageOfNetSalesPayableAsRoyalty |
Scenario, Forecast |  |
Co Promotion [Line Items] |  |
Percentage of net sales payable as royalty |  | 6.00%lgnd_PercentageOfNetSalesPayableAsRoyalty / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

X
- Details
Name: | lgnd_CoPromotionLineItems
Namespace Prefix: | lgnd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of net sales payable as royalty. + References No definition available. + Details
Name: | lgnd_PercentageOfNetSalesPayableAsRoyalty
Namespace Prefix: | lgnd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |