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Statements of Comprehensive Loss Parenthetical (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Stock-based compensation expense associated with research and development expense | $ 1,472 | $ 1,345 | $ 4,522 | $ 3,698
Stock-based compensation expense associated with selling, general and administrative expense | $ 1,405 | $ 1,235 | $ 4,327 | $ 3,516

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

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