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Borrowings - Narrative (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Dec. 07, 2018 | Sep. 30, 2017 | Mar. 31, 2020 | Mar. 31, 2019 | Nov. 30, 2019
Loan payable | Capital Royalty Partners II LP |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loan repayment |  | $ 17,800 |  |  |
2017 Term loan | Loan payable | Innovatus Life Sciences Lending Fund |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term loan borrowings | $ 5,000 | $ 20,000 |  |  |
Term loan, interest rate |  |  |  |  | 8.50%
Term loan, paid in-kind, interest rate |  |  |  |  | 2.00%
Term loan, effective interest rate |  |  |  |  | 10.00%
Term loan, fee incurred upon payment of final installment |  |  |  |  | $ 1,000
Term loan, prepayment premium percentage |  |  |  |  | 3.00%
Term loan, annual reduction in prepayment penalty percentage |  |  |  |  | 1.00%
Term loan covenant, minimum unrestricted cash balance |  |  |  |  | $ 2,000
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 | $ 200 |

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