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Sinovant and Sunovion License Agreements (Details)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
item
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
License Agreement                        
Revenue accounted for under Topic 606   $ 333 $ 6,920 $ 525 $ 1,703 $ 797 $ 461 $ 847 $ 7,551 $ 9,481 $ 9,656 $ 5,319
Collaboration revenue - Upfront payment                        
License Agreement                        
Revenue accounted for under Topic 606                   $ 1,538    
Sunovion Pharmaceutics Canada, Inc. | Collaboration revenue - Upfront payment                        
License Agreement                        
Revenue not accounted for under Topic 606 $ 1,000                      
License Agreement | Sinovant Sciences, LTD                        
License Agreement                        
Notice period for termination of agreement                   180 days    
Number of deliverables | item   2               2    
License Agreement | Sinovant Sciences, LTD | Achievement of certain regulatory and commercial milestones                        
License Agreement                        
Maximum contingent milestone payment   $ 91,500               $ 91,500    
License Agreement | Sinovant Sciences, LTD | Subsequent regulatory approval                        
License Agreement                        
Maximum contingent milestone payment   4,000               4,000    
License Agreement | Sinovant Sciences, LTD | Clinical trial application submission                        
License Agreement                        
Proceeds from license agreement, milestone         $ 1,500              
License Agreement | Sinovant Sciences, LTD | FDA approval                        
License Agreement                        
Revenue accounted for under Topic 606     $ 5,000                  
License Agreement | Sinovant Sciences, LTD | Additional regulatory approvals and annual sales targets                        
License Agreement                        
Remaining milestone payments   $ 86,500               $ 86,500    
License Agreement | Sinovant Sciences, LTD | Collaboration revenue - Upfront payment                        
License Agreement                        
Revenue accounted for under Topic 606 $ 5,000