Revenue Recognition - Summary of Revenues Classified by Major Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Revenues:
Total net revenues	$ 86,280	$ 98,662	$ 180,706	$ 192,305
United States
Revenues:
Total net revenues	21,955	36,781	57,084	68,875
Other Americas
Revenues:
Total net revenues	35	25	37	68
Germany
Revenues:
Total net revenues	23,131	24,667	42,640	56,711
Other Europe, Middle East and Africa
Revenues:
Total net revenues	2,567	13,196	6,530	16,665
Japan
Revenues:
Total net revenues	25,413	13,779	51,489	26,452
Other Asia-Pacific
Revenues:
Total net revenues	$ 13,179	$ 10,214	$ 22,926	$ 23,534