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Subsequent Event (Details)
$ in Millions
1 Months Ended
Nov. 30, 2015
USD ($)
Subsequent Event [Abstract]  
Sanofi Upfront Payment $ 300
Sanofi Development and Regulatory Milestone Payments 430
Sanofi Sales Milestone Payments $ 990
Sanofi Maximum Royalty Percentage 40.00%
Sanofi Commercialization Costs Funded By Lexicon Percentage 40.00%
Sanofi Commercialization Costs Funded by Lexicon Maximum Amount $ 100