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Revenue and Vendor Concentrations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Revenue, Major Customer [Line Items] |  |  |
Accounts receivable, net | $ 14,938 | $ 16,821 |
Revenue | Customer Concentration Risk |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue | $ 22,800 | $ 20,000 | $ 10,400
Revenue | Customer Concentration Risk | Customer One |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk percentage | 17.00% | 22.00% | 23.00%
Revenue | Customer Concentration Risk | Customer Two |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk percentage | 10.00% | 10.00% |
Revenue | Geographic Concentration Risk | International |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk percentage | 31.00% | 27.00% | 14.00%
Accounts Receivable | Customer Concentration Risk |  |  |
Revenue, Major Customer [Line Items] |  |  |
Accounts receivable, net | $ 5,400 | $ 5,700 | $ 1,300
Long-term Assets | Geographic Concentration Risk | International |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk percentage | 68.00% | 72.00% |
Long-term Assets, Excluding Goodwill and Intangible Assets | Geographic Concentration Risk | International |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk percentage | 12.00% | 13.00% |

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