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Segment Information - Major customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Customer Revenues	$ 49,208	$ 61,793
Customer A | Sales Revenue, Net | Customer Concentration Risk
Segment Reporting Information [Line Items]
Customer Revenues	$ 600	$ 6,500
Concentration risk percentage	1.00%	10.00%
Customer A | Accounts Receivable | Customer Concentration Risk
Segment Reporting Information [Line Items]
Accounts receivable, gross	$ 16,200	$ 4,700
Concentration risk percentage	62.00%	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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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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