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Revenue - Revenue Recognition (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Capitalized Contract Cost [Line Items]      
Current contract assets $ 2,600   $ 2,700
Non-current contract assets 0   0
Current contract liabilities 2,220   1,893
Non-current contract liabilities 300   400
Revenue recognized included in contract liabilities 400    
Current capitalized costs 116   137
Non-current capitalized costs 0    
Incremental costs amortized 90 $ 87  
Impairment related to costs capitalized $ 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    
Maximum      
Capitalized Contract Cost [Line Items]      
Amortization Period 6 years    
Europe | Maximum      
Capitalized Contract Cost [Line Items]      
Payment terms 90 days    
TS      
Capitalized Contract Cost [Line Items]      
Current capitalized costs $ 13   13
Non-current capitalized costs 6   9
Incremental costs amortized 3 $ 3  
Impairment related to costs capitalized $ 0   $ 0