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Equity Incentive Awards (Details 5) (Performance Units, USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012
Performance Units |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Performance Stock Units Outstanding | 0 | 329
Performance Stock Units, Nonvested, Weighted Average Grant Date Fair Value | $ 0.00 | $ 1.90
Performance Stock Units Vested | (329) |
Performance Stock Units, Vested in Period, Weighted Average Grant Date Fair Value | $ 1.90 |

X
- Definition The weighted average fair value of nonvested performance-based stock units for which the employer is contingently obligated to issue equity instruments to an employee who has not yet satisfied performance criteria necessary to gain title to the underlying shares. + References No definition available. + Details
Name: | lxrx_PerformanceStockUnitsNonvestedWeightedAverageGrantDateFairValue
Namespace Prefix: | lxrx_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of performance-based stock units that validly exist and are outstanding as of the balance sheet date. + References No definition available. + Details
Name: | lxrx_PerformanceStockUnitsOutstanding
Namespace Prefix: | lxrx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of performance-based stock units that were vested during the reporting period. + References No definition available. + Details
Name: | lxrx_PerformanceStockUnitsVested
Namespace Prefix: | lxrx_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average fair value as of grant date pertaining to performance-based stock units that were vested during the reporting period. + References No definition available. + Details
Name: | lxrx_PerformanceStockUnitsVestedInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | lxrx_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration