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Revenue - Schedule of Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Account receivables, net of allowance | $ 9,659 | $ 13,178
Account receivables, net of allowance Year-to-date Change | (3,519) |
Unbilled receivables - current | 14,453 | 7,984
Deferred revenue | 4,614 | $ 5,456
Deferred revenue Year-to-date Change | $ (842) |
Year-to-date Change [Member] |  |
Changes in Account receivables, net of allowance, percentage | (26.70%) |
Changes in Unbilled receivables - current, percentage | 81.00% |
Changes in Deferred revenue, percentage | (15.40%) |
Year-to-date Change [Member] |  |
Unbilled receivables - current | $ 6,469 |

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