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Avinza Co-Promotion (Narrative) (Details) (AVINZA, Organon) | Mar. 31, 2015 | Dec. 31, 2012
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AVINZA | Organon |  |
AVINZA Co-Promotion (Textual) [Abstract] |  |
Percentage of net sales payable as royalty | 6.00%lgnd_PercentageOfNetSalesPayableAsRoyalty / dei_LegalEntityAxis = lgnd_OrganonMember / us-gaap_ProductOrServiceAxis = lgnd_AvinzaProductLineMember | 6.50%lgnd_PercentageOfNetSalesPayableAsRoyalty / dei_LegalEntityAxis = lgnd_OrganonMember / us-gaap_ProductOrServiceAxis = lgnd_AvinzaProductLineMember

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