Revenue Concentration (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Sep. 30, 2019
Revenue, Major Customer [Line Items]
Revenue	$ 23,192	$ 19,983	$ 45,259	$ 37,666
Accounts receivable, net	13,727		13,727		$ 14,938
Customer Concentration Risk | Sales Revenue Net
Revenue, Major Customer [Line Items]
Revenue	6,600	6,200	11,800
Customer Concentration Risk | Accounts Receivable
Revenue, Major Customer [Line Items]
Accounts receivable, net	$ 5,000	$ 4,700	$ 5,000	4,700
Customer Concentration Risk | Customer One | Sales Revenue Net
Revenue, Major Customer [Line Items]
Revenue				$ 6,900
Total revenue, percentage	14.00%	17.00%	16.00%	18.00%
Customer Concentration Risk | Customer Two | Sales Revenue Net
Revenue, Major Customer [Line Items]
Total revenue, percentage	14.00%	14.00%	11.00%
Geographic Concentration Risk | Sales Revenue Net
Revenue, Major Customer [Line Items]
Total revenue, percentage			25.00%	35.00%
Geographic Concentration Risk | Long-term Assets | International
Revenue, Major Customer [Line Items]
Total revenue, percentage			60.00%		68.00%
Geographic Concentration Risk | Long-term Assets, Excluding Goodwill and Other Intangibles | International
Revenue, Major Customer [Line Items]
Total revenue, percentage			13.00%		12.00%