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Stock-Based Compensation (Details 2) (Stock Option [Member]) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Stock Option [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Expected Volatility Rate, Employees | 63.00%lxrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedvolatilityrateEmployees / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 66.00%lxrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedvolatilityrateEmployees / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Expected Volatility Rate, Officers and Non-employee Directors | 81.00%lxrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateOfficersAndNonEmployeeDirectors / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 80.00%lxrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateOfficersAndNonEmployeeDirectors / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Risk Free Interest Rate, Employees | 1.20%lxrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateEmployee / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 1.10%lxrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateEmployee / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Risk Free Interest Rate, Officers and Non-employee Directors | 1.90%lxrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateOfficersAndNonEmployeeDirectors / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 2.30%lxrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateOfficersAndNonEmployeeDirectors / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Expected Term, Employees | 4 years | 4 years
Expected Term, Officers and Non-employee Directors | 8 years | 8 years
Expected Dividend Rate, Employees | 0.00%lxrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRateEmployees / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 0.00%lxrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRateEmployees / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember
Expected Dividend Rate, Officers and Non-employee Directors | 0.00%lxrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRateOfficersAndNonEmployeeDirectors / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember | 0.00%lxrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRateOfficersAndNonEmployeeDirectors / us-gaap_AwardTypeAxis = us-gaap_StockOptionMember

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the employees' option's term. + References No definition available. + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the officers' and non-employee directors' option's term. + References No definition available. + Details
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- Definition The expected term assumption that is used in valuing an option on its own shares for employees. + References No definition available. + Details
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- Definition The expected term assumption that is used in valuing an option on its own shares for officers and non-employee directors. + References No definition available. + Details
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- Definition For employees, the estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition For officers and non-employee directors, the estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares for employees. + References No definition available. + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares for officers and non-employee directors. + References No definition available. + Details
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- Details
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