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Accounts Receivable and Contract Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Accounts Receivable and Contract Assets [Abstract] |  |
Accounts receivable - customers | $ 5,633 | $ 4,574
Other receivables | 206 | 152
Accounts receivable | 5,839 | 4,726
Less: allowance for doubtful accounts | (655) | (305)
Accounts receivable, net | 5,184 | 4,421
Unbilled revenue | 2,847 | $ 2,276
Change in accounts receivable - customers | 1,059 |
Change in other receivables | 54 |
Change in accounts receivable | 1,113 |
Change in allowance for doubtful accounts | (350) |
Change in accounts receivable, net | 763 |
Change in unbilled revenue | $ 571 |

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