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Segment Information - Major customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2020
Segment Reporting Information [Line Items]
Customer Revenues	$ 13,721	$ 13,780	$ 39,197	$ 47,521
Customer A | Sales Revenue, Net | Customer Concentration Risk
Segment Reporting Information [Line Items]
Customer Revenues	$ 1,400	$ 1,600	$ 2,200	$ 2,300
Concentration risk percentage	11.00%	11.00%	6.00%	5.00%
Customer B | Sales Revenue, Net | Customer Concentration Risk
Segment Reporting Information [Line Items]
Customer Revenues	$ 500	$ 1,900	$ 2,300	$ 4,200
Concentration risk percentage	4.00%	14.00%	6.00%	9.00%
Customer B | Accounts Receivable | Customer Concentration Risk
Segment Reporting Information [Line Items]
Accounts receivable, gross	$ 12,400		$ 12,400		$ 4,700
Concentration risk percentage			51.00%		28.00%

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- Definition

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

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