Revenue Recognition - Summary of Revenues Classified by Major Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues:
Total net revenues	$ 89,041	$ 96,801	$ 269,747	$ 289,106
United States
Revenues:
Total net revenues	23,317	31,632	80,401	100,507
Other Americas
Revenues:
Total net revenues	20	37	57	105
Germany
Revenues:
Total net revenues	18,880	24,519	61,520	81,230
Other Europe, Middle East and Africa
Revenues:
Total net revenues	4,561	10,574	11,091	27,239
Japan
Revenues:
Total net revenues	17,476	19,032	68,965	45,484
Other Asia-Pacific
Revenues:
Total net revenues	$ 24,787	$ 11,007	$ 47,713	$ 34,541