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Assets Held for Sale	6 Months Ended
Assets Held for Sale	Jun. 30, 2015
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 June 30, 2015. The Company estimated the fair value of the net assets to be sold at approximately $23.8 million as of June 30, 2015, which represents estimated selling price less costs to sell. The fair value of the net assets to be sold was determined using Level 2 inputs using sales prices in similar real estate sales and offers received from potential purchasers of the building as well as considering future cash flows that may be generated from leasing the building.