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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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