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Equity Incentive Awards and Warrants (Details 4) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Stock Bonus and Restricted Stock, Grants in Period | 94,112 | 200,277
Share-based Compensation Arrangement by Share-based Payment Award, Stock Bonus and Restricted Stock, Grants in Period, Weighted Average Grant Date Fair Value | $ 1.70 | $ 1.81

X
- Definition The number of grants of stock bonus and restricted stock awards made during the period under equity incentive plans. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition The weighted average grant date fair value for grants of stock bonus and restricted stock awards made during the period under equity incentive plans. + References No definition available. + Details
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Namespace Prefix: | lxrx_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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