Convertible Senior Notes - Interest Costs Recognized on 2026 Notes (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Total interest expense recognized	$ 2,137	$ 2,008
Convertible Debt | 2026 Notes
Debt Instrument [Line Items]
Contractual interest expense	293	293
Amortization of debt discount and issuance costs	1,844	1,715
Total interest expense recognized	$ 2,137	$ 2,008