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Equity Incentive Awards and Warrants (Details 6) (Performance Units [Member], USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011
Performance Units [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Performance Stock Units Outstanding | 329 | 350
Performance Stock Units, Nonvested, Weighted Average Grant Date Fair Value | $ 1.90 | $ 1.90
Performance Stock Units Forfeited | (21) |
Performance Stock Units, Forfeited in Period, Weighted Average Grant Date Fair Value | $ 1.90 |

X
- Definition The number of performance-based stock units that were forfeited during the reporting period. + References No definition available. + Details
Name: | lxrx_PerformanceStockUnitsForfeited
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 forfeited during the reporting period. + References No definition available. + Details
Name: | lxrx_PerformanceStockUnitsForfeitedInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | lxrx_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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