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License Agreements - Catalent Agreement (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 31, 2017
Mar. 31, 2016
License agreements      
Research and development   $ 10,740 $ 2,370
Catalent | Collaborative arrangement      
License agreements      
Last patent right expiration period 10 years    
Automatic extension period 1 year    
Research and development   $ 0 $ 0
Catalent | Collaborative arrangement | Maximum      
License agreements      
Milestone payment to be paid $ 1,575