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Revenue - Schedule of Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Jan. 02, 2018 | Dec. 31, 2017
Account receivables, net of allowance | $ 4,762 |  |
Unbilled receivables - current | 4,574 |  |
Unbilled receivables - non-current | 92 |  |
Deferred revenue | 4,620 | $ 5,083 | $ 4,311
January 1, 2018 [Member] |  |  |
Account receivables, net of allowance | 7,940 |  |
Unbilled receivables - current | 4,574 |  |
Unbilled receivables - non-current | 184 |  |
Deferred revenue | 5,083 |  |
Year-to-date Change [Member] |  |  |
Account receivables, net of allowance | (3,178) |  |
Unbilled receivables - current | 27 |  |
Unbilled receivables - non-current | (92) |  |
Deferred revenue | $ (463) |  |
Changes in Account receivables, net of allowance, percentage | (40.00%) |  |
Changes in Unbilled receivables - current, percentage | 0.60% |  |
Changes in Unbilled receivables - non-current, percentage | (50.00%) |  |
Changes in Deferred revenue, percentage | (9.10%) |  |

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