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Revenue - Revenue Recognition (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Sep. 30, 2022
Capitalized Contract Cost [Line Items]          
Current contract assets $ 2,300   $ 2,300   $ 4,400
Non-current contract assets 0   0   0
Current contract liabilities 3,700   3,700   4,100
Revenue recognized included in contract liability     1,900    
Current capitalized costs 155   155   128
Non-current capitalized costs 0   0   0
Incremental costs amortized $ 98 $ 91 199 $ 181  
Impairment related to costs capitalized     $ 0 0  
Payment terms     30 days    
Practical Expedient, Incremental Costs     true    
Remaining Performance Obligation, Optional Exemption     true    
Minimum          
Capitalized Contract Cost [Line Items]          
Amortization Period 3 years   3 years    
Maximum          
Capitalized Contract Cost [Line Items]          
Amortization Period 6 years   6 years    
Europe | Maximum          
Capitalized Contract Cost [Line Items]          
Payment terms     90 days    
TS          
Capitalized Contract Cost [Line Items]          
Current capitalized costs $ 3   $ 3   $ 9
Incremental costs amortized $ 3 $ 3 6 6  
Impairment related to costs capitalized     $ 0 $ 0