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Segment Information - Major customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |
Customer Revenues | $ 16,572 | $ 18,980 |
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 | $ 2,600 | $ 1,300 |
% of Total Revenues | 16.00% | 7.00% |
Customer B |  |  |
Segment Reporting Information [Line Items] |  |  |
Customer Revenues | $ 1,800 | $ 1,000 |
% of Total Revenues | 11.00% | 5.00% |
Customer B | Accounts Receivable | Customer Concentration Risk |  |  |
Segment Reporting Information [Line Items] |  |  |
Accounts receivable, gross | $ 5,600 |  | $ 7,400
% of Total Revenues | 32.00% |  | 36.00%

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