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Debt - Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 14, 2021 | Jul. 17, 2020
Long-term debt |  |  |  |
Amortization of debt issuance costs | $ 464 | $ 452 |  |
Effective interest rate of the liability component | 10.10% |  |  | 11.00%
1.50% Convertible senior notes due 2026 |  |  |  |
Long-term debt |  |  |  |
Contractual interest expense | $ 1,069 | 1,069 |  |
Amortization of debt issuance costs | 283 | 277 |  |
Total | $ 1,352 | $ 1,346 | $ 2,100 |
Effective interest rate of the liability component | 1.90% | 1.90% |  |
Convertible debt | 3.00% Convertible senior notes due 2022 |  |  |  |
Long-term debt |  |  |  |
Contractual interest expense | $ 1,110 | $ 1,110 |  |
Amortization of debt issuance costs | 181 | 175 |  |
Total | $ 1,291 | $ 1,285 |  |
Effective interest rate of the liability component | 3.50% | 3.50% |  |

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