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Debt - Liability Related To Sale of Future Royalties (Details) - USD ($)
$ in Thousands, shares in Millions
6 Months Ended
Jan. 07, 2018
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]          
Common stock   $ 2,311   $ 2,125  
RPI Finance Trust | Funding agreement          
Debt Instrument [Line Items]          
Payments for future royalties $ 175,000        
Royalty purchase agreement arrangements consideration 250,000        
Liability related to sale of future royalties 182,200 288,700   261,200  
Common stock $ 67,800        
Annual interest rate in calculating liability related to sale of future royalties 21.00%        
Period which company will accrete the liability 20 years        
Interest expense recognized   27,500 $ 20,400    
Private placement | RPI Finance Trust | Funding agreement          
Debt Instrument [Line Items]          
Stock issued during period (in shares) 4.4        
Sale of stock, consideration received on transaction $ 75,000        
Royalty Arrangement | RPI Finance Trust          
Debt Instrument [Line Items]          
Liability related to sale of future royalties   288,693 241,668 $ 261,224 $ 221,295
Interest expense recognized   $ 27,469 $ 20,373