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Borrowings - Narrative (Details) - USD ($)		1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 07, 2018	Sep. 30, 2017	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Nov. 30, 2019
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%
Term loan, fee incurred upon payment of final installment							$ 1,000,000.0
Term loan, prepayment premium percentage							3.00%
Term loan, annual reduction in prepayment penalty percentage							1.00%
Term loan covenant, minimum unrestricted cash balance							$ 2,000,000.0
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	$ 200,000	$ 300,000	$ 300,000

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