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Sinovant License Agreement (Details)
$ in Millions
1 Months Ended 3 Months Ended
Feb. 28, 2019
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
item
Mar. 31, 2018
USD ($)
Collaboration revenue - Variable consideration | Clinical trial application submission        
License Agreement        
Revenue accounted for under Topic 606     $ 1.5  
License Agreement | Sinovant Sciences, LTD        
License Agreement        
Notice period for termination of agreement     180 days  
Number of deliverables | item     2  
License Agreement | Sinovant Sciences, LTD | Achievement of certain regulatory and commercial milestones        
License Agreement        
Maximum contingent milestone payment   $ 91.5   $ 91.5
License Agreement | Sinovant Sciences, LTD | Subsequent regulatory approval        
License Agreement        
Maximum contingent milestone payment   4.0   4.0
License Agreement | Sinovant Sciences, LTD | Clinical trial application submission        
License Agreement        
Proceeds from license agreement, milestone $ 1.5      
License Agreement | Sinovant Sciences, LTD | Collaboration revenue - upfront payment        
License Agreement        
Revenue accounted for under Topic 606   $ 5.0   5.0
License Agreement | Sinovant Sciences, LTD | Collaboration revenue - Variable consideration | Clinical trial application submission        
License Agreement        
Revenue accounted for under Topic 606       $ 1.5