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Segment Information - Major customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Customer Revenues | $ 13,532 | $ 21,570 | $ 46,199 | $ 56,900 |
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 | $ 800 | $ 3,800 | $ 4,000 | $ 6,800 |
% of Total Revenues | 6.00% | 18.00% | 9.00% | 12.00% |
Customer B | Sales Revenue, Net [Member] | Customer Concentration Risk |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Customer Revenues | $ 3,200 | $ 3,000 | $ 7,000 | $ 5,000 |
% of Total Revenues | 23.00% | 14.00% | 15.00% | 9.00% |
Customer B | Accounts Receivable | Customer Concentration Risk |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Accounts receivable, gross | $ 6,300 |  | $ 6,300 |  | $ 7,400
% of Total Revenues |  |  | 39.00% |  | 36.00%
Customer C | Sales Revenue, Net [Member] | Customer Concentration Risk |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Customer Revenues | $ 1,600 | $ 1,900 | $ 2,300 | $ 3,400 |
% of Total Revenues | 12.00% | 9.00% | 5.00% | 6.00% |

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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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