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Revenue Concentration (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2019
Revenue, Major Customer [Line Items] |  |  |
Revenue | $ 22,067 | $ 17,683 |
Accounts receivable, net | 12,875 |  | $ 14,938
Customer Concentration Risk | Sales Revenue Net |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue | 8,100 | 5,500 |
Customer Concentration Risk | Accounts Receivable |  |  |
Revenue, Major Customer [Line Items] |  |  |
Accounts receivable, net | $ 4,400 | $ 3,900 |
Customer Concentration Risk | Customer One | Sales Revenue Net |  |  |
Revenue, Major Customer [Line Items] |  |  |
Total revenue, percentage | 20.00% | 20.00% |
Customer Concentration Risk | Customer Two | Sales Revenue Net |  |  |
Revenue, Major Customer [Line Items] |  |  |
Total revenue, percentage | 17.00% | 11.00% |
Geographic Concentration Risk | Sales Revenue Net |  |  |
Revenue, Major Customer [Line Items] |  |  |
Total revenue, percentage | 25.00% | 35.00% |
Geographic Concentration Risk | Long-term Assets | International |  |  |
Revenue, Major Customer [Line Items] |  |  |
Total revenue, percentage | 62.00% |  | 68.00%
Geographic Concentration Risk | Long-term Assets, Excluding Goodwill and Intangibles | International |  |  |
Revenue, Major Customer [Line Items] |  |  |
Total revenue, percentage | 15.00% |  | 12.00%

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