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Commitments and Contingencies (Textual 2 - HETLIOZ) - Additional Information (Detail) (USD $)
1 Months Ended 6 Months Ended
Feb. 28, 2004
Jun. 30, 2014
Commitments and Contingencies [Line Items]    
Milestone payment under license agreement   $ 8,000,000
Percentage of future sublicense fees payable to third-party Mid-twenties  
In the event that cumulative sales of HETLIOZ reach $250.0 million
   
Commitments and Contingencies [Line Items]    
Possible future milestone payment in the event product reaches a certain agreed upon sales threshold 25,000,000  
Hetlioz
   
Commitments and Contingencies [Line Items]    
Royalty payment 10.00%  
Hetlioz | License Agreement
   
Commitments and Contingencies [Line Items]    
Milestone payment under license agreement   $ 8,000,000