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Revenue - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Capitalized Contract Cost [Line Items]          
Current contract assets $ 1,600   $ 1,600   $ 600
Non-current contract assets 0   0   0
Current contract liabilities 1,267   1,267   741
Non-current contract liabilities 200   200   300
Revenue recognized included in contract liabilities 100   400    
Current capitalized costs 82   82   85
Non-current capitalized costs 0   0   0
Incremental costs amortized 81 $ 66 243 $ 174  
Impairment related to costs capitalized $ 0   $ 0    
Payment terms     30 days    
Practical Expedient, Incremental Costs     true    
Practical Expedient, Financing Component     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   47
Non-current capitalized costs 25   25   $ 0
Incremental costs amortized 3 $ 1 9 $ 9  
Impairment related to costs capitalized $ 0   $ 0