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License Agreements (Details)
$ in Thousands, € in Millions
3 Months Ended 7 Months Ended 9 Months Ended 12 Months Ended
Mar. 09, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2016
EUR (€)
Dec. 31, 2006
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2016
EUR (€)
Dec. 31, 2005
USD ($)
Eisai | License Agreement              
License Agreements              
Period after the date of the first commercial sale of the product for license expiration         10 years 10 years  
Initial license fee paid $ 400     $ 500      
Eisai | License Agreement | Minimum              
License Agreements              
Payments to be made upon achievement of certain clinical and regulatory milestones         $ 1,000    
Eisai | License Agreement | Maximum              
License Agreements              
Payments to be made upon achievement of certain clinical and regulatory milestones         $ 20,000    
Clinical Trial Services Agreement | Ipsen              
License Agreements              
Nonrefundable, non-creditable payment             $ 250
Royalty rate (as a percent)         5.00% 5.00%  
Payments to be made upon achievement of certain clinical and regulatory milestones   $ 3,300 € 3.0        
Clinical Trial Services Agreement | Ipsen | Minimum              
License Agreements              
Additional payments to be made upon achievement of certain development and commercialization milestones         $ 11,200 € 10.0  
Period after the date of the first commercial sale of the product for license expiration         10 years 10 years  
Clinical Trial Services Agreement | Ipsen | Maximum              
License Agreements              
Additional payments to be made upon achievement of certain development and commercialization milestones         $ 40,400 € 36.0  
Clinical Trial Services Agreement | Ipsen | Sublicense Agreement              
License Agreements              
Period after the date of the first commercial sale of the product for license expiration         10 years 10 years