Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Capitalized Contract Cost [Line Items]
Current contract assets	$ 1,000	$ 600
Non-current contract assets	0	0
Current contract liabilities	947	741
Non-current contract liabilities	200	300
Revenue recognized included in contract liabilities	500
Current capitalized costs	130	85
Non-current capitalized costs	0	0
Incremental costs amortized	332	235
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
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	47
Non-current capitalized costs	22	0
Incremental costs amortized	13	13
Impairment related to costs capitalized	$ 0	$ 0