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Revenue - Schedule of Contract Assets and Liabilities (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 | Jan. 02, 2018 | Dec. 31, 2017
Account receivables, net of allowance | $ 8,300 | $ 7,940 |
Unbilled receivables - current | 3,389 | 4,547 | $ 4,547
Unbilled receivables - non-current |  | 184 | 184
Deferred revenue | 5,872 | $ 5,083 | $ 4,311
Year-to-date Change [Member] |  |  |
Account receivables, net of allowance | 360 |  |
Unbilled receivables - current | (1,158) |  |
Unbilled receivables - non-current | (184) |  |
Deferred revenue | $ 789 |  |
Changes in Account receivables, net of allowance, percentage | 4.50% |  |
Changes in Unbilled receivables - current, percentage | (25.50%) |  |
Changes in Unbilled receivables - non-current, percentage | (100.00%) |  |
Changes in Deferred revenue, percentage | 15.50% |  |

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