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Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2015
Commitments and Contingencies [Abstract]
Commitments and Contingencies Disclosure	Commitments and Contingencies Operating Lease Obligations: A Lexicon subsidiary leases office space in Basking Ridge, New Jersey under a lease agreement, the term of which began in June 2015 and terminates in December 2022. Rent expense is recognized on a straight-line basis over the lease term. Lexicon is the guarantor of the obligations of its subsidiary under this lease agreement. The maximum potential amount of future payments the Company could be required to make under this agreement is $4.2 million as of September 30, 2015. Under a lease that expired in June 2015, the Company is required to maintain restricted investments to collateralize a standby letter of credit for this lease. The Company had $0.4 million and $0.4 million in restricted investments as collateral as of September 30, 2015 and December 31, 2014, respectively. Additionally, Lexicon leases certain equipment under operating leases. Legal Proceedings. Lexicon is from time to time party to claims and legal proceedings that arise in the normal course of its business and that it believes will not have, individually or in the aggregate, a material adverse effect on its results of operations, financial condition or liquidity.