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Segment Information - Major customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |  |
Customer Revenues | $ 14,088 | $ 16,883 | $ 25,476 | $ 33,741 |
Customer A | Sales Revenue, Net | Customer Concentration Risk |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Customer Revenues | $ 1,200 | $ 2,000 | $ 1,800 | $ 3,800 |
Concentration risk percentage | 8.00% | 12.00% | 7.00% | 11.00% |
Customer A | Accounts Receivable | Customer Concentration Risk |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Accounts receivable, gross | $ 13,000 |  | $ 13,000 |  | $ 4,700
Concentration risk percentage |  |  | 56.00% |  | 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
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