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Statements of Comprehensive Loss Parenthetical (Parenthetical) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Stock-based compensation expense associated with research and development expense | $ 1,104 lxrx_StockBasedCompensationExpenseAssociatedWithResearchAndDevelopmentExpense | $ 1,458 lxrx_StockBasedCompensationExpenseAssociatedWithResearchAndDevelopmentExpense
Stock-based compensation expense associated with general and administrative expense | $ 849 lxrx_StockBasedCompensationExpenseAssociatedWithGeneralAndAdministrativeExpense | $ 792 lxrx_StockBasedCompensationExpenseAssociatedWithGeneralAndAdministrativeExpense

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

X
- 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