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Related Party Balances and Transactions (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 25, 2016 | May 19, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Related Party Transaction [Line Items] |  |  |  |  |  |
Aggregated revenue |  |  |  |  |  | $ 62
Aggregate net amounts of lease expenses |  |  |  | 807 | 604 | 411
Revenues aggregated total amount |  |  |  | $ 31 | 139 | 107
Reimburse expenses |  |  |  |  | 730 |
Renovation and reimburse expenses |  |  |  |  | $ 585 |
Sale of ordinary shares |  | 1,818,182 |  | 5,189 | 5,189 |
Follow-on public offering [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Public offering price per share | $ 11.00 |  |  |  |  |
Aggregate net amount of public offering | $ 21,279 |  |  |  |  |
RAD-BYNET Group [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Joint ownership percentage of principal shareholders |  |  |  | 25.00% |  |
AT&T Engagement [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Pursuant to AT&T Engagement |  |  |  | $ 24,528 | $ 18,310 |
Executive Chairman [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Salary expenses |  |  | $ 30 | 183 | 180 |
Consultant [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party expense |  |  |  |  |  | $ 24
Director [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Sale of ordinary shares | 200,000 |  |  |  |  |
Investment in issuance of ordinary shares | $ 2,200 |  |  |  |  |
Amdocs [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Pursuant to AT&T Engagement |  |  |  | $ 24,528 | $ 18,322 |

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