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License Agreements License Agreements (Additional Information) (Detail)
1 Months Ended 12 Months Ended
Jul. 17, 2014
USD ($)
milestone_payment
Mar. 18, 2013
milestone_payment
Mar. 30, 2013
USD ($)
Dec. 31, 2015
USD ($)
Mar. 31, 2013
USD ($)
License And Collaboration Agreements [Line Items]          
Milestone payment       $ 5,000,000  
Cash paid for acquisition of Abstral rights     $ 10,000,000    
Phase one milestone payment       500,000  
Phase two milestone payment       $ 250,000  
Phase two milestone payment period       30 days  
Zuplenz [Member]          
License And Collaboration Agreements [Line Items]          
Milestone payment $ 16,500,000        
Number of one-time future milestone payments | milestone_payment 6        
Zuplenz [Member] | Minimum [Member]          
License And Collaboration Agreements [Line Items]          
Net sales target $ 20,000,000        
Zuplenz [Member] | Maximum [Member]          
License And Collaboration Agreements [Line Items]          
Net sales target $ 100,000,000        
Orexo [Member]          
License And Collaboration Agreements [Line Items]          
Remaining cash held of Abstral rights         $ 5,000,000
Number of one-time future milestone payments | milestone_payment   3      
Estimated year of licensed patents expiration       2019  
M D Anderson Cancer Center [Member]          
License And Collaboration Agreements [Line Items]          
Annual maintenance fee       $ 200,000  
Milestone payment       $ 200,000