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Summary of Significant Accounting Policies Concentration of Credit Risk (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounting Policies [Abstract] |  |  |
Disclosure On Geographic Areas Revenue From External Customers Attributed to France | 60.00% | 83.00% | 99.00%
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Entity's Country of Domicile, Percent | 40.00% | 17.00% | 1.00%

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- Definition Revenues from external customers attributed to the entity's country of domicile as a percentage of total revenue. + References No definition available. + Details
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- Definition Revenues from external customers attributed to France as a percentage of total revenue. + References No definition available. + Details
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Namespace Prefix: | lxrx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
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