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Commitments and Contingencies (Textual 3) - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2006
Dec. 31, 2004
Tasimelteon    
Payment to BMS as an initial license fee   $ 0.5
Possible future tasimelton milestone payments to BMS   Less than $40.0 million
Milestone payment under license agreement 1.0  
Future percentage of royalty payments based net sales of tasimelteon   Low teens
Percentage of future sublicense fees payable to BMS Mid-twenties  
License Agreement | Upon acceptance of NDA by FDA
   
Tasimelteon    
Obligation to make tasimelteon milestone payments 3.0  
License Agreement | Upon approval of NDA by FDA
   
Tasimelteon    
Obligation to make tasimelteon milestone payments $ 8.0