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Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012
Deferred Tax Assets and Liabilities |  |
Document Period End Date | Dec. 31, 2013 |
Deferred Tax Assets, Operating Loss Carryforwards | $ 238,608 | $ 216,579
Deferred Tax Assets, Tax Credit Carryforwards, Research | 37,453 | 32,066
Deferred Tax Assets, In Process Research and Development | 83,375 | 71,839
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost | 7,703 | 12,972
Deferred Tax Assets, Deferred Income | 4,760 | 4,906
Deferred Tax Assets, Other | 4,712 | 10,429
Deferred Tax Assets, Gross | 376,611 | 348,791
Deferred Tax Liability Related to Acquisition of Symphony Icon | (18,745) | (18,745)
Deferred Tax Liabilities, Other | 0 | (340)
Deferred Tax Liabilities, Gross | (18,745) | (19,085)
Deferred Tax Assets, Valuation Allowance | (376,611) | (348,451)
Deferred Tax Liabilities, Net | $ (18,745) | $ (18,745)

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition On July 30, 2010, Lexicon entered into an Amended and Restated Purchase Option Agreement with Symphony Icon and Holdings and simultaneously exercised the Purchase Option, thereby reacquiring the Programs. Pursuant to the amended terms of the Purchase Option, Lexicon paid Holdings $10 million and issued 13,237,519 shares of common stock to designees of Holdings on July 30, 2012 in satisfaction of an additional $35 million base payment obligation. Lexicon also agreed to make up to $45 million in additional payments, which will consist of 50% of any consideration Lexicon receives pursuant to any licensing transaction under which Lexicon grants a third party rights to commercialize LX1032, LX1033 or other pharmaceutical compositions modulating the same target as those drug candidates. This represents the deferred tax liability relating to the tax impact of future amortization or possible impairments associated with intangible assets acquired with Symphony Icon, which are not deductible for tax purposes. + References No definition available. + Details
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