Quarterly report pursuant to Section 13 or 15(d)

Avinza Co-Promotion (Narrative) (Details)

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