Revenue - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019
Capitalized Contract Cost [Line Items]
Current contract assets	$ 1,400		$ 1,400		$ 600
Non-current contract assets	0		0		0
Current contract liabilities	1,379		1,379		741
Non-current contract liabilities	200		200		300
Revenue recognized included in contract liabilities			300
Current capitalized costs	122		122		85
Non-current capitalized costs	0		0		0
Incremental costs amortized	84	$ 56	162	$ 108
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	28		28		$ 0
Incremental costs amortized	$ 6	$ 3	3	$ 6
Impairment related to costs capitalized			$ 0