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Borrowing - Narrative (Details) - USD ($) | Oct. 17, 2023 | Feb. 23, 2022 | Sep. 30, 2023 | May 31, 2018
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Principal outstanding |  |  | $ 28,861,000 |
2018 Exit Fee |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Agreed amount for exit fee upon occurrence of certain conditions |  |  |  | $ 1,500,000
2022 Exit Fee | Subsequent event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Exit fee (as percent) | 2.00% |  |  |
Exit fee, term (in years) | 10 years |  |  |
2018 Term Loan | Loan Agreement |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Term loan face amount |  |  |  | $ 50,000,000
Principal outstanding |  | $ 25,000,000 |  |
2022 Term Loan | Loan Agreement |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Loan agreement covenant, cash and cash equivalents as percentage of outstanding loan balance, minimum |  | 80.00% |  |
Loan agreement, covenant, cash and cash equivalents as percentage of outstanding loan balance, calculation period (in months) |  | 6 months |  |
Loan agreement covenant, net product revenue as percentage of outstanding loan balance, minimum |  | 60.00% |  |
Additional default interest rate (as percent) |  | 4.00% |  |
2022 Term Loan | Loan Agreement | Subsequent event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Final fee due upon maturity, acceleration, prepayment, or termination (as percent) | 4.95% |  |  |
2022 Term Loan | Loan Agreement | Subsequent event | Prior to first anniversary of closing date |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Prepayment premium (as percent) | 3.00% |  |  |
2022 Term Loan | Loan Agreement | Subsequent event | After first anniversary through second anniversary of closing date |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Prepayment premium (as percent) | 2.00% |  |  |
2022 Term Loan | Loan Agreement | Subsequent event | After second anniversary to maturity date |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Prepayment premium (as percent) | 1.00% |  |  |
Term Loan A | Loan Agreement |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from the sale of future royalties, net of issuance costs |  | $ 27,500,000 |  |
Term Loan A | Loan Agreement | Subsequent event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate (as percent) | 7.95% |  |  |
Closing fee | $ 200,000 |  |  |
Term Loan A | Loan Agreement | Subsequent event | Secured Overnight Financing Rate (SOFR) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating per annum rate (as percent) | 0.022% |  |  |
Term Loan A | Loan Agreement | Subsequent event | Floor Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating per annum rate (as percent) | 1.00% |  |  |
Term Loan B | Loan Agreement | Subsequent event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Remaining funding based on milestone achievement | $ 22,500,000 |  |  |
Interest rate (as percent) | 7.95% |  |  |
Future obligation upon loan funding or other events | $ 100,000 |  |  |
Term Loan B | Loan Agreement | Subsequent event | Secured Overnight Financing Rate (SOFR) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating per annum rate (as percent) | 0.022% |  |  |
Term Loan B | Loan Agreement | Subsequent event | Floor Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating per annum rate (as percent) | 1.00% |  |  |
Term Loan C | Loan Agreement | Subsequent event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Additional committed capital | $ 50,000,000 |  |  |
Interest rate (as percent) | 4.25% |  |  |
Closing fee | $ 300,000 |  |  |
Term Loan C | Loan Agreement | Subsequent event | Secured Overnight Financing Rate (SOFR) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating per annum rate (as percent) | 0.022% |  |  |
Term Loan C | Loan Agreement | Subsequent event | Floor Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating per annum rate (as percent) | 4.70% |  |  |
Term Loan D | Loan Agreement | Subsequent event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Additional uncommitted capital | $ 50,000,000 |  |  |
Interest rate (as percent) | 4.25% |  |  |
Closing fee percentage | 0.50% |  |  |
Term Loan D | Loan Agreement | Subsequent event | Secured Overnight Financing Rate (SOFR) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating per annum rate (as percent) | 0.022% |  |  |
Term Loan D | Loan Agreement | Subsequent event | Floor Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Floating per annum rate (as percent) | 4.70% |  |  |

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