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Borrowings - Narrative (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Dec. 07, 2018 | Nov. 30, 2019 | Sep. 30, 2017 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Loan payable | Capital Royalty Partners II LP |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loan repayment |  |  | $ 17,800,000 |  |  |  |
2017 Term loan | Loan payable | Innovatus Life Sciences Lending Fund |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Term loan borrowings | $ 5,000,000 |  | $ 20,000,000 |  |  | $ 0 |
Term loan, interest rate |  | 8.50% |  |  |  |  |
Term loan, paid in-kind, interest rate |  | 2.00% |  |  |  |  |
Term loan, effective interest rate |  | 10.00% |  |  |  |  |
Debt instrument, term |  | 24 months |  |  |  |  |
Term loan, fee incurred upon payment of final installment |  | $ 1,000,000 |  |  |  |  |
Term loan, prepayment premium percentage |  | 2.00% |  |  |  |  |
Term loan, annual reduction in prepayment penalty percentage |  | 1.00% |  |  |  |  |
Term loan covenant, minimum unrestricted cash balance |  | $ 2,000,000.0 |  |  |  |  |
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 |  |  |  | $ 100,000 | $ 100,000 | $ 400,000 | $ 400,000

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