Name:	lxrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRateEmployees
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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.

No definition available.

Name:	lxrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRateOfficersAndNonEmployeeDirectors
Namespace Prefix:	lxrx_
Data Type:	num:percentItemType
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Period Type:	duration

The expected term assumption that is used in valuing an option on its own shares for employees.

No definition available.

Name:	lxrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermEmployees
Namespace Prefix:	lxrx_
Data Type:	xbrli:durationItemType
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The expected term assumption that is used in valuing an option on its own shares for officers and non-employee directors.

No definition available.

Name:	lxrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedTermOfficersAndNonEmployeeDirectors
Namespace Prefix:	lxrx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.

Name:	lxrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateOfficersAndNonEmployeeDirectors
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Data Type:	num:percentItemType
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Period Type:	duration

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.

No definition available.

Name:	lxrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedvolatilityrateEmployees
Namespace Prefix:	lxrx_
Data Type:	num:percentItemType
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Period Type:	duration

The risk-free interest rate assumption that is used in valuing an option on its own shares for employees.

No definition available.

Name:	lxrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateEmployee
Namespace Prefix:	lxrx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The risk-free interest rate assumption that is used in valuing an option on its own shares for officers and non-employee directors.

No definition available.

Name:	lxrx_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateOfficersAndNonEmployeeDirectors
Namespace Prefix:	lxrx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.