Revenue Recognition - Summary of Revenues Classified by Major Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Revenues:
Total net revenues	$ 67,825	$ 68,393	$ 206,160	$ 152,051
United States
Revenues:
Total net revenues	16,018	21,742	115,487	43,098
Other Americas
Revenues:
Total net revenues	52	28	136	54
Germany
Revenues:
Total net revenues	35,424	24,627	54,557	42,791
Other Europe, Middle East and Africa
Revenues:
Total net revenues	3,457	3,512	8,232	7,184
Japan
Revenues:
Total net revenues	4,548	5,738	10,171	31,579
Other Asia-Pacific
Revenues:
Total net revenues	$ 8,326	$ 12,746	$ 17,577	$ 27,345