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Subsequent Event (Details) (USD $) In Millions, unless otherwise specified | 1 Months Ended
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Jan. 31, 2014
Subsequent Event |
Workforce Reduction Total Cost Low End of Range | $ 6.0
Workforce Reduction Total Cost High End of Range | 7.0
Workforce Reduction Percentage of Cash Expenditures Low End of Range | 90.00%
Workforce Reduction Percentage of Cash Expenditures High End of Range | 95.00%
Workforce Reduction Termination Costs Low End of Range | 5.0
Workforce Reduction Termination Costs High End of Range | $ 6.0

X
- Definition Lexicon’s board of directors committed to a workforce reduction. This represents the high end of the range of cash expenditures as a percentage of total costs expected as a result of the reduction in staff. + References No definition available. + Details
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Namespace Prefix: | lxrx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lexicon’s board of directors committed to a workforce reduction. This represents the low end of the range of cash expenditures as a percentage of total costs expected as a result of the reduction in staff. + References No definition available. + Details
Name: | lxrx_WorkforceReductionPercentageofCashExpendituresLowEndofRange
Namespace Prefix: | lxrx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lexicon’s board of directors committed to a workforce reduction. This represents the high end of the range of severance and other one-time termination benefits costs expected as a result of the reduction in staff. + References No definition available. + Details
Name: | lxrx_WorkforceReductionTerminationCostsHighEndofRange
Namespace Prefix: | lxrx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Lexicon’s board of directors committed to a workforce reduction. This represents the low end of the range of severance and other one-time termination benefits costs expected as a result of the reduction in staff. + References No definition available. + Details
Name: | lxrx_WorkforceReductionTerminationCostsLowEndofRange
Namespace Prefix: | lxrx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Lexicon’s board of directors committed to a workforce reduction. This represents the high end of the range of total costs expected as a result of the reduction in staff. + References No definition available. + Details
Name: | lxrx_WorkforceReductionTotalCostHighEndofRange
Namespace Prefix: | lxrx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Lexicon's board of directors committed to a workforce reduction. This represents the low end of the range of total costs expected as a result of the reduction in staff. + References No definition available. + Details
Name: | lxrx_WorkforceReductionTotalCostLowEndofRange
Namespace Prefix: | lxrx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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