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Revenue Recognition - Summary of Revenues Classified by Major Geographic Region (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Revenues:        
Total net revenues $ 68,393 $ 86,280 $ 152,051 $ 180,706
United States        
Revenues:        
Total net revenues 21,742 21,955 43,098 57,084
Other Americas        
Revenues:        
Total net revenues 28 35 54 37
Germany        
Revenues:        
Total net revenues 24,627 23,131 42,791 42,640
Other Europe, Middle East and Africa        
Revenues:        
Total net revenues 3,512 2,567 7,184 6,530
Japan        
Revenues:        
Total net revenues 5,738 25,413 31,579 51,489
Other Asia-Pacific        
Revenues:        
Total net revenues $ 12,746 $ 13,179 $ 27,345 $ 22,926