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v2.4.1.9

Subsequent Event (Details) (Subsequent Event, USD $) In Millions, unless otherwise specified | 0 Months Ended
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May 11, 2015 program
Subsequent Event |
Subsequent Event [Line Items] |
Number of rights to biologic development programs | 15 lgnd_NumberofIntangibleAssetsAcquired / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Payments to acquire rights to biologic development programs | $ 4.0 us-gaap_PaymentsToAcquireIntangibleAssets / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X
- Definition Number of Intangible Assets Acquired + References No definition available. + Details
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Namespace Prefix: | lgnd_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireIntangibleAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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