Revenue Recognition - Summary of Revenues Classified by Major Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenues:
Total net revenues	$ 94,426	$ 93,643
United States
Revenues:
Total net revenues	35,129	32,094
Other Americas
Revenues:
Total net revenues	2	43
Germany
Revenues:
Total net revenues	19,509	32,044
Other Europe, Middle East and Africa
Revenues:
Total net revenues	3,963	3,469
Japan
Revenues:
Total net revenues	26,076	12,673
Other Asia-Pacific
Revenues:
Total net revenues	$ 9,747	$ 13,320