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Borrowings - Narrative (Details) - USD ($)		1 Months Ended		3 Months Ended		6 Months Ended
	Dec. 07, 2018	Nov. 30, 2019	Sep. 30, 2017	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 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	$ 5,000,000.0		$ 20,000,000.0			$ 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		$ 1,000,000.0
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	$ 300,000	$ 300,000

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