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Statements of Comprehensive Loss Parenthetical (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Stock-based compensation expense associated with research and development expense | $ 1,395 | $ 1,169 | $ 3,050 | $ 2,353
Stock-based compensation expense associated with selling, general and administrative expense | $ 1,503 | $ 1,234 | $ 2,922 | $ 2,281

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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