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Arrangements with Symphony Icon, Inc. (Tables)

12 Months Ended

Dec. 31, 2012

Arrangements with Symphony Icon Inc [Abstract]

Schedule of Purchase Price Allocation [Table Text Block]

Cash and cash equivalents	$	4,439
Prepaid expenses	545
Intangible assets - in-process research and development	53,557
Total identifiable assets	58,541
Accounts payable and accrued liabilities	(2,984		)
Deferred tax liability	(18,745		)
Total liabilities assumed	(21,729		)
Net identifiable assets acquired	36,812
Goodwill	18,745
Net assets acquired	$	55,557

Business Acquisition, Pro Forma Information [Table Text Block]

Revenues	$	4,908
Net loss attributable to Lexicon Pharmaceuticals, Inc.	(97,818		)

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Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate.

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