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Subsequent Event	9 Months Ended
Subsequent Event	Sep. 30, 2012
Subsequent Event [Abstract]
Subsequent Events [Text Block]	Subsequent Event In October 2012, Lexicon sold 17,500,000 shares of its common stock at a price of $2.25 per share in a public offering, resulting in net proceeds of approximately $37.2 million, after deducting underwriting discounts and commissions of $2.0 million and estimated offering expenses of $0.2 million.