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Revenue Concentration (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Revenue, Major Customer [Line Items]
Accounts receivable, net	$ 16,602	$ 15,612
Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Revenue	$ 20,200	$ 15,800	$ 22,800
Revenue | Customer Concentration Risk | Customer One
Revenue, Major Customer [Line Items]
Concentration risk percentage	17.00%	16.00%	17.00%
Revenue | Customer Concentration Risk | Customer Two
Revenue, Major Customer [Line Items]
Concentration risk percentage			10.00%
Revenue | Geographic Concentration Risk | International
Revenue, Major Customer [Line Items]
Concentration risk percentage	26.00%	24.00%	31.00%
Accounts Receivable | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Accounts receivable, net	$ 3,400	$ 4,500	$ 5,400
Long-term Assets | Geographic Concentration Risk | International
Revenue, Major Customer [Line Items]
Concentration risk percentage	24.00%	66.00%
Long-term Assets, Excluding Goodwill and Intangible Assets | Geographic Concentration Risk | International
Revenue, Major Customer [Line Items]
Concentration risk percentage	6.00%	15.00%

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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