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Segment Information - Major customers (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |
Customer Revenues | $ 12,369 | $ 11,388
Customer A | Sales Revenue, Net | Customer Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Customer Revenues |  | $ 1,100
Concentration risk percentage |  | 10.00%
Customer B | Sales Revenue, Net | Customer Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Customer Revenues | $ 1,900 | $ 600
Concentration risk percentage | 16.00% | 5.00%
Customer B | Accounts Receivable | Customer Concentration Risk |  |
Segment Reporting Information [Line Items] |  |
Accounts receivable, gross | $ 10,500 |
Concentration risk percentage | 40.00% |

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