Significant Accounting Policies - Summarize the impact of adopting ASU 2020-06 (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Oct. 01, 2022	Sep. 30, 2022
Summary Of Significant Accounting Policies [Line Items]
Deferred tax assets	$ 54,387	$ 54,452	$ 51,989
Long-term debt, net of discounts and issuance costs	264,687	270,430	259,436
Additional paid-in capital	1,038,048	1,015,171	1,029,542
Accumulated deficit	$ (305,655)	(277,408)	$ (283,249)
As Previously Reported
Summary Of Significant Accounting Policies [Line Items]
Deferred tax assets		51,989
Long-term debt, net of discounts and issuance costs		259,436
Additional paid-in capital		1,029,542
Accumulated deficit		(283,249)
Revision of Prior Period, Adjustment | ASU 2020-06
Summary Of Significant Accounting Policies [Line Items]
Deferred tax assets		2,463
Long-term debt, net of discounts and issuance costs		10,994
Additional paid-in capital		(14,371)
Accumulated deficit		$ 5,841