Debt Obligations	6 Months Ended
Debt Obligations	Jun. 30, 2011
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 has a ten-year term with a 20-year amortization and bears interest at a fixed rate of 8.23%. The mortgage had a principal balance outstanding of $25.6 million as of June 30, 2011. Net proceeds from the sale of the building as discussed in Note 6, "Fair Value Measurements," were used to pay down the mortgage principal in June 2011 in the amount of $2.4 million. 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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