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Revenue - Revenue Recognition (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Capitalized Contract Cost [Line Items]          
Current contract assets $ 1,700   $ 1,700   $ 1,000
Non-current contract assets 0   0   0
Current contract liabilities 1,446   1,446   947
Non-current contract liabilities 600   600   200
Revenue recognized included in contract liabilities     500    
Current capitalized costs 204   204   130
Non-current capitalized costs 0   0    
Incremental costs amortized 89 $ 84 260 $ 162  
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 $ 13   $ 13   13
Non-current capitalized costs 13   13   $ 22
Incremental costs amortized $ 3 $ 3 9 $ 9  
Impairment related to costs capitalized     $ 0