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Revenue - Schedule of Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Account receivables, net of allowance | $ 13,178 | $ 7,735
Unbilled receivables - current | 7,984 | 3,105
Deferred revenue | 5,456 | $ 6,595
Year-to-date Change [Member] |  |
Account receivables, net of allowance | 5,443 |
Unbilled receivables - current | 4,789 |
Deferred revenue | $ (1,139) |
Changes in Account receivables, net of allowance, percentage | 70.40% |
Changes in Unbilled receivables - current, percentage | 154.20% |
Changes in Deferred revenue, percentage | (17.30%) |

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