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Subsequent Event (Details) (Onyx Pharmaceuticals, Subsequent Event, USD $) In Millions, unless otherwise specified | 12 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2013 Kyprolis | Mar. 31, 2014 Scenario, Forecast
Subsequent Event [Line Items] |  |
Commercial milestone payment |  | $ 1
Annual product sales | $ 250 |

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- Definition Revenue Recognition, Milestone Method, Milestone, Revenue earned by Counterparty + References No definition available. + Details
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Namespace Prefix: | lgnd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of consideration recognized during the period for the milestone or milestones. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 28 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=19771982&loc=SL6892177-166501 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration