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Borrowings - Narrative (Details)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 07, 2018
USD ($)
Nov. 30, 2019
payment
Sep. 30, 2017
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Loan payable | Capital Royalty Partners II LP          
Debt Instrument [Line Items]          
Loan repayment     $ 17.8    
2017 Term loan | Loan payable | Innovatus Life Sciences Lending Fund          
Debt Instrument [Line Items]          
Term loan borrowings $ 5.0   $ 20.0    
Term loan, interest rate   8.50%      
Term loan, paid in-kind, interest rate   2.00%      
Term loan, effective interest rate       10.00%  
Number of payments | payment   24      
Term loan, fee incurred upon payment of final installment       $ 1.0  
Term loan, prepayment premium percentage       3.00%  
Term loan, annual reduction in prepayment penalty percentage       1.00%  
Term loan, covenant, revenue performance period       12 months  
Term loan, covenant, number of days to cure covenant if performance measure is not met       60 days  
Term loan covenant, minimum unrestricted cash balance       $ 2.0  
Term loan covenant, increase to interest rate       4.00%  
2017 Term loan | Paid in-kind note | Innovatus Life Sciences Lending Fund          
Debt Instrument [Line Items]          
Term loan, paid in-kind loans issued       $ 0.5 $ 0.5