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Segment Information - Major customers (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
Segment Reporting Information [Line Items] |  |  |  |  |
Customer Revenues | $ 16,095 | $ 16,350 | $ 32,667 | $ 35,330 |
Accounts Receivable | Customer Concentration Risk |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
% of Total Revenues |  |  | 10.00% |  |
Customer A | Sales Revenue, Net [Member] | Customer Concentration Risk |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Customer Revenues | $ 500 | $ 1,700 | $ 3,100 | $ 3,000 |
% of Total Revenues | 3.00% | 11.00% | 10.00% | 9.00% |
Customer B | Sales Revenue, Net [Member] | Customer Concentration Risk |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Customer Revenues | $ 2,000 | $ 1,000 | $ 3,800 | $ 2,000 |
% of Total Revenues | 13.00% | 6.00% | 12.00% | 6.00% |
Customer B | Accounts Receivable | Customer Concentration Risk |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Accounts receivable, gross | $ 5,600 |  | $ 5,600 |  | $ 7,400
% of Total Revenues |  |  | 31.00% |  | 36.00%

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