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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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