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Avinza Co-Promotion (Details Textual)	Dec. 31, 2013
Co Promotion [Line Items]
Percentage of net sales payable as royalty	6.50%
Scenario, Forecast
Co Promotion [Line Items]
Percentage of net sales payable as royalty	6.00%

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