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Commitments and Contingencies (Textual 2 - HETLIOZ) - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
0 Months Ended 12 Months Ended
Jul. 31, 2013
Dec. 31, 2004
Dec. 31, 2013
License Agreement
Dec. 31, 2004
Hetlioz
Maximum
Dec. 31, 2004
Hetlioz
License Agreement
HETLIOZ          
Milestone payment under license agreement $ 3.0 $ 0.5 $ 1.0    
Possible future milestone payments       37.0 8.0
Possible future milestone payment in the event HETLIOZ reaches a certain agreed upon sales threshold   $ 25.0      
Future percentage of royalty payments based net sales of HETLIOZ   Low teens      
Percentage of future sublicense fees payable to BMS   Mid-twenties