Income Taxes - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Current:
Federal	$ 0	$ 0	$ 0
State	292	(325)	(355)
Foreign	0	0	0
Total	292	(325)	(355)
Non-current:
Federal	0	0	0
State	0	0	0
Foreign	(9,102)	6,678	7,049
Total	(9,102)	6,678	7,049
Total income tax provision	$ (8,810)	$ 6,353	$ 6,694

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