Revenue - Impact of Adoption on Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net loss	$ (820)	$ (1,788)
Capitalized commissions	87	70
Prepaid expenses and other current assets	216	24
Accounts payable and accrued liabilities	(136)	(752)
Other long-term liabilities	(6)	(22)
Unearned revenue	(1,090)	(1,183)
Net cash used in operating activities	$ (418)	$ 248