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Revenue and Vendor Concentrations (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Revenue, Major Customer [Line Items]
Accounts receivable, net	$ 14,938	$ 16,821
Revenue | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Revenue	$ 22,800	$ 20,000	$ 10,400
Revenue | Customer Concentration Risk | Customer One
Revenue, Major Customer [Line Items]
Concentration risk percentage	17.00%	22.00%	23.00%
Revenue | Customer Concentration Risk | Customer Two
Revenue, Major Customer [Line Items]
Concentration risk percentage	10.00%	10.00%
Revenue | Geographic Concentration Risk | International
Revenue, Major Customer [Line Items]
Concentration risk percentage	31.00%	27.00%	14.00%
Accounts Receivable | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Accounts receivable, net	$ 5,400	$ 5,700	$ 1,300
Long-term Assets | Geographic Concentration Risk | International
Revenue, Major Customer [Line Items]
Concentration risk percentage	68.00%	72.00%
Long-term Assets, Excluding Goodwill and Intangible Assets | Geographic Concentration Risk | International
Revenue, Major Customer [Line Items]
Concentration risk percentage	12.00%	13.00%

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- Definition

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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