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Financing Arrangements (Details Textual)	Dec. 31, 2013
Debt Disclosure [Abstract]
Additional final payment on borrowings	6.00%

X

- 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