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Convertible Senior Notes - Interest Costs Recognized on 2026 Notes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021
Debt Instrument [Line Items] |  |  |  |
Total interest expense recognized | $ 2,040 | $ 1,319 | $ 4,048 | $ 1,319
Convertible Debt | 2026 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual interest expense | 302 | 172 | 595 | 172
Amortization of debt discount and issuance costs | 1,738 | 1,147 | 3,453 | 1,147
Total interest expense recognized | $ 2,040 | $ 1,319 | $ 4,048 | $ 1,319

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