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Fair Value - Additional Information (Details)
1 Months Ended 12 Months Ended
Dec. 20, 2018
USD ($)
Milestone
Apr. 30, 2019
USD ($)
Jan. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
Apr. 23, 2019
USD ($)
Dec. 19, 2018
USD ($)
Apr. 10, 2015
shares
Apr. 09, 2015
$ / shares
Fair Value                    
Number of investments transferred from level 1 to level 2 | item       0            
Number of investments transferred from level 2 to level 1 | item       0            
Milestone payment due upon approval of NDA               $ 45,000,000.0    
Milestone payment due within 30 days $ 5,000,000.0                  
Milestone payment due             $ 5,000,000.0      
Milestone payment due within 180 days 5,000,000.0                  
Milestone additional payment approval of NDA $ 45,000,000.0                  
Number of milestone payment upon approval of NDA | Milestone 7                  
Milestone annual payment $ 6,400,000                  
Milestone payments received   $ 5,000,000.0 $ 5,000,000.0              
Contingent consideration       $ 32,400,000 $ 65,200,000          
(Decrease) increase in the fair value of contingent consideration       (22,800,000) (19,600,000) $ 21,600,000        
2023 Term Loan                    
Fair Value                    
Amount to be realized in future       277,900,000 $ 274,700,000          
Warrants                    
Fair Value                    
Proceeds from the sale of warrants       3,000,000.0            
Recro                    
Fair Value                    
Warrants purchase under amendments | shares                 350,000  
Warrant strike price | $ / shares         $ 8.26         $ 19.46
Maximum | Recro                    
Fair Value                    
Milestone payment receivable       80,000,000.0            
Other (Expense) Income, Net                    
Fair Value                    
Increase (decrease) in fair value of warrants         $ (200,000)          
Warrants realized gain losses       $ 900,000            
Other (Expense) Income, Net | Maximum                    
Fair Value                    
Increase (decrease) in fair value of warrants           $ 100,000        
Discount Rate | Future royalties                    
Fair Value                    
Discount rate (as a percent) | item       16.0            
Discount Rate | Real options approach                    
Fair Value                    
Discount rate (as a percent) | item       16.0