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Statements of Comprehensive Loss Parentheticals (Parentheticals) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Stock-based compensation expense associated with research and development expense | $ 3,673 | $ 3,249 | $ 3,170
Stock-based compensation expense associated with general and administrative expense | $ 2,822 | $ 2,458 | $ 2,308

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- Definition Stock-based compensation expense associated with general and administrative expense. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Stock-based compensation expense included in research and development expense. + References No definition available. + Details
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Namespace Prefix: | lxrx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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