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Convertible Senior Notes - Interest Costs Recognized on 2026 Notes (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2022 | Jun. 30, 2022 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total interest expense recognized | $ 2,107 | $ 2,077 | $ 2,040 | $ 2,008 | $ 1,587 | $ 2,223 | $ 1,319 | $ 0 | $ 4,048 | $ 6,125 | $ 8,232 | $ 5,129 | $ 0
Convertible Debt | Convertible Senior Unsecured Notes Due 2026 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual interest expense |  |  |  |  |  |  |  |  |  |  | 1,179 | 756 |
Amortization of debt discount and issuance costs |  |  |  |  |  |  |  |  |  |  | 7,053 | 4,372 |
Total interest expense recognized |  |  |  |  |  |  |  |  |  |  | $ 8,232 | $ 5,128 |

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