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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, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Debt Instrument [Line Items]
Total interest expense recognized	$ 2,163	$ 2,040	$ 4,300	$ 4,048
Convertible Debt | 2026 Notes
Debt Instrument [Line Items]
Contractual interest expense	307	293	600	595
Amortization of debt discount and issuance costs	1,857	1,715	3,701	3,453
Total interest expense recognized	$ 2,164	$ 2,008	$ 4,301	$ 4,048

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