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Avinza Co-Promotion (Details Textual)	Dec. 31, 2013	Nov. 30, 2017
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

X

- 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: