Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Revenue Concentration (Details) - USD ($) $ in Thousands	12 Months Ended
Revenue Concentration (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Revenue, Major Customer [Line Items]
Accounts receivable, net	$ 15,612	$ 14,938
Revenue \| Customer Concentration Risk
Revenue, Major Customer [Line Items]
Revenue		$ 22,800	$ 20,000
Revenue \| Customer Concentration Risk \| Customer One
Revenue, Major Customer [Line Items]
Revenue	$ 15,800
Concentration risk percentage	16.00%	17.00%	22.00%
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	24.00%	31.00%	27.00%
Accounts Receivable \| Customer Concentration Risk
Revenue, Major Customer [Line Items]
Accounts receivable, net	$ 4,500	$ 5,400	$ 5,700
Long-term Assets \| Geographic Concentration Risk \| International
Revenue, Major Customer [Line Items]
Concentration risk percentage	66.00%	68.00%
Long-term Assets, Excluding Goodwill and Intangible Assets \| Geographic Concentration Risk \| International
Revenue, Major Customer [Line Items]
Concentration risk percentage	15.00%	12.00%