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Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	Jan. 01, 2019	Jan. 01, 2018	Jan. 01, 2017
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

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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.

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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.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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

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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
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