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Equity Incentive Awards (Details 3) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Stock Bonus and Restricted Stock, Grants in Period | 20,512 | 10,248 | 11,456
Share-based Compensation Arrangement by Share-based Payment Award, Stock Bonus and Restricted Stock to Consultants, Grants in Period, Weighted Average Grant Date Fair Value | $ 7.80 | $ 15.61 | $ 13.96

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- 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

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- Definition The weighted average grant date fair value for grants of stock bonus and restricted stock awards made to consultants 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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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