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Basis of Presentation (Accounting for Share-Based Compensation) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Basis of Presentation [Line Items] |  |
Share-based compensation expense total | $ 2,067 | $ 1,124
Research and development expenses |  |
Basis of Presentation [Line Items] |  |
Share-based compensation expense total | 689 | 386
General and administrative expenses |  |
Basis of Presentation [Line Items] |  |
Share-based compensation expense total | $ 1,378 | $ 738

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- Details
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Namespace Prefix: | lgnd_
Data Type: | xbrli:stringItemType
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- Definition The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration