Debt Obligations	9 Months Ended
Debt Obligations	Sep. 30, 2014
Debt Obligations [Abstract]
Debt Disclosure	Debt Obligations Mortgage Loan. In April 2004, Lexicon obtained a $34.0 million mortgage on its facilities in The Woodlands, Texas. The mortgage loan originally had a ten-year term with a 20-year amortization and a fixed interest rate of 8.23%. The mortgage was amended in September 2013 to extend the maturity date from April 2014 to April 2017, with the mortgage loan’s monthly payment amount and fixed interest rate each remaining unchanged. The mortgage had a principal balance outstanding of $20.6 million as of September 30, 2014. This entire balance has been classified as current liabilities on the accompanying consolidated balance sheet as of September 30, 2014 as management intends to repay the mortgage when the assets that serve as collateral for the mortgage loan are sold. These assets have been reclassified to assets held for sale as of September 30, 2014, as discussed in Note 7, Assets Held for Sale. The fair value of Lexicon’s mortgage loan approximates its carrying value. The fair value of Lexicon’s mortgage loan is estimated using discounted cash flow analysis, based on the Company’s current incremental borrowing rate.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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