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Recent Accounting Pronouncements (Details) - USD ($) $ in Millions | Jan. 01, 2019 | Jan. 01, 2018 | Jan. 01, 2017
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Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Accumulated Excess Tax Benefits Recognized as Deferred Tax Assets |  |  | $ 6.1
Adjustment to Accumulated Deficit |  |  | $ 2.0
Subsequent Event | Accounting Standards Update 2016-02 |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Right-of-use assets | $ 2.1 |  |
Lease liabilities | $ 2.1 |  |
Accumulated Deficit |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |
Adjustment to Accumulated Deficit to ASC606 |  | $ 14.2 |

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- Definition Lexicon will adopt ASU 2016-09, "Stock Compensation." This represents the accumulated excess tax benefits that will be recognized as deferred tax assets upon adoption. + References No definition available. + Details
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- Definition Lexicon will adopt ASU 2016-09, "Stock Compensation." This represents the adjustment to accumulated deficit as a result of making an entity-wide accounting policy election to account for forfeitures of share-based payment awards as they occur instead of estimating the number of awards that are expected to vest. + References No definition available. + Details
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- Definition lxrx_Adjustment to Accumulated Deficit to ASC606 - Lexicon will adopt ASU 2014-09, "Revenue Recognition" on 1-1-18. This represents the adjustment to accumulated deficit as a result of adopting the new standard. + References No definition available. + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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