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Collaboration and License Agreements (Details) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020
Collaboration and License Agreements [Abstract] |  |  |  |
Sanofi termination cash payment | $ 26,000 |  |  |
Ipsen Revenue Recognized |  |  |  | $ 300
lxrx_sanofi initial cash payment | $ 26,000 | $ 26,000 |  |
Settlement Payment from Termination |  |  | $ 208,000 |

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- Definition Collaboration and License Agreements [Abstract] + References No definition available. + Details
Name: | lxrx_CollaborationAndLicenseAgreementsAbstract
Namespace Prefix: | lxrx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition In October 2014, Lexicon entered into a License and Collaboration Agreement with Ipsen Pharma SAS for the development and commercialization of Lexicon's drug candidate telotristat etiprate (LX1032) outside the United States and Japan. This represents the revenue recognized in the period. + References No definition available. + Details
Name: | lxrx_IpsenRevenueRecognized
Namespace Prefix: | lxrx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition lxrx_Sanofi termination cash payment - represents the cash payment from Sanofi to terminate the collaboration alliance + References No definition available. + Details
Name: | lxrx_Lxrx_Sanofiterminationcashpayment
Namespace Prefix: | lxrx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition lxrx_sanofi initial cash payment + References No definition available. + Details
Name: | lxrx_Lxrx_sanofiInitialCashPayment
Namespace Prefix: | lxrx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Settlement Payment from Termination + References No definition available. + Details
Name: | lxrx_SettlementPaymentFromTermination
Namespace Prefix: | lxrx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration