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Borrowings - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 07, 2018 | Sep. 30, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |
Warrants issued to purchase redeemable convertible preferred stock |  |  | 461,273 |  | 461,273 |  |
Number of common shares to be called upon exercise of warrants |  |  | 512,363 |  | 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 |  |  | 1100.00% |  | 1100.00% |  |
Term loan, paid in-kind, interest rate |  |  | 250.00% |  | 250.00% |  |
Term loan, effective interest rate |  |  | 1400.00% |  | 1400.00% |  |
Term loan, fee incurred upon payment of final installment |  |  | $ 1,000 |  | $ 1,000 |  |
Term loan, prepayment premium percentage |  |  | 3.00% |  | 3.00% |  |
Term loan, annual reduction in prepayment penalty percentage |  |  | 100.00% |  | 100.00% |  |
Term loan covenant, interest only milestones, increase to interest rate |  |  | 800.00% |  | 800.00% |  |
Term loan covenant, minimum issuance of equity securities and subordinated debt |  |  | $ 9,500 |  | $ 9,500 |  |
Term loan covenant, minimum unrestricted cash balance |  |  | $ 2,000 |  | $ 2,000 |  |
Term loan covenant, increase to interest rate |  |  | 400.00% |  | 400.00% |  |
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 |  |  | $ 200 | $ 100 | $ 500 | $ 400 |

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