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Borrowings - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 07, 2018	Sep. 30, 2017	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Nov. 30, 2019	Sep. 30, 2019	Dec. 31, 2017
Debt Instrument [Line Items]
Term loan borrowings				$ 0	$ 4,995
Warrants issued to purchase redeemable convertible preferred stock				461,273
Number of common shares to be called upon exercise of warrants							512,363
Series F redeemable convertible preferred stock
Debt Instrument [Line Items]
Number of common shares to be called upon exercise of warrants							104,722
Loan payable | Capital Royalty Partners II LP
Debt Instrument [Line Items]
Loan repayment			$ 17,800
2017 Term loan | Loan payable
Debt Instrument [Line Items]
Term loan, issuance costs								$ 100
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				100.00%
Term loan covenant, minimum unrestricted cash balance				$ 2,000
Term loan covenant, increase to interest rate				4.00%
Term loan, issuance costs								$ 400
2017 Term loan | Loan payable | Innovatus Life Sciences Lending Fund | Series F redeemable convertible preferred stock
Debt Instrument [Line Items]
Warrants issued to purchase redeemable convertible preferred stock	3,846,154							15,384,615
Warrants issued to purchase redeemable convertible preferred stock, exercise price (in dollars per share)								$ 0.078
Number of common shares to be called upon exercise of warrants								104,722
2017 Term loan | Paid in-kind note | Innovatus Life Sciences Lending Fund
Debt Instrument [Line Items]
Term loan, paid in-kind loans issued				$ 500

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