Summary of Significant Accounting Policies - Contract Assets and Liabilities (Details) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Capitalized Contract Cost [Line Items]
Current contract assets	$ 2,700,000	$ 1,000,000.0
Non-current contract assets	0
Current contract liabilities	1,893,000	947,000
Non-current contract liabilities	400,000	200,000
Revenue recognized included in contract liabilities	$ 800,000
Practical Expedient, Incremental Costs	true
Current capitalized costs	$ 137,000	130,000
Non-current capitalized costs	0
Incremental costs amortized	442,000	332,000
Impairment related to costs capitalized	$ 0
Payment terms	30 days
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
TS
Capitalized Contract Cost [Line Items]
Current capitalized costs	$ 13,000	13,000
Non-current capitalized costs	22,000	9,000
Incremental costs amortized	13,000	$ 13,000
Impairment related to costs capitalized	$ 0
Europe | Maximum
Capitalized Contract Cost [Line Items]
Payment terms	90 days