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Financing Arrangements (Details Textual) | Dec. 31, 2014
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Debt Disclosure [Abstract] |
Additional final payment on borrowings | 6.00%

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- Definition Line of credit facility additional payment on borrowings percentage. + References No definition available. + Details
Name: | lgnd_LineOfCreditFacilityAdditionalPaymentOnBorrowingsPercentage
Namespace Prefix: | lgnd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration