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Assets Held for Sale	9 Months Ended
Assets Held for Sale	Sep. 30, 2014
Assets Held for Sale [Abstract]
Disclosure of Long Lived Assets Held-for-sale	Assets Held for Sale Lexicon’s buildings and land have been reclassified as assets held for sale on the consolidated balance sheet as of September 30, 2014. The Company estimated the fair value of the net assets to be sold at approximately $23.8 million as of September 30, 2014, which represents estimated selling price less costs to sell. This resulted in an impairment loss on the assets held for sale of $13.1 million in the nine months ended September 30, 2014, which was recorded in impairment loss on buildings in the accompanying consolidated statements of comprehensive loss for the three and nine months ended September 30, 2014.