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Convertible Senior Notes - Interest Costs Recognized on 2026 Notes (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |
Total interest expense recognized | $ 2,008 | $ 0
Convertible Debt | 2026 Notes |  |
Debt Instrument [Line Items] |  |
Contractual interest expense | 293 | 0
Amortization of debt discount and issuance costs | 1,715 | 0
Total interest expense recognized | $ 2,008 | $ 0

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