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Convertible Senior Notes - Carrying Value of 2026 Notes (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Sep. 30, 2021 | Feb. 05, 2021
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
2026 Notes embedded conversion derivative |  | $ 48,208 |
Convertible Debt | 2026 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | $ 155,250 | 155,250 |
Less: unamortized discount and issuance costs, net of amortization | (30,880) | (34,332) |
Carrying amount | 124,370 | 120,918 |
Convertible Debt | 2026 Notes | Embedded conversion derivative |  |  |
Debt Instrument [Line Items] |  |  |
Less: unamortized discount and issuance costs, net of amortization | (30,900) |  |
2026 Notes embedded conversion derivative | $ 0 | $ 48,208 | $ 33,200

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