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v3.19.1

General (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2017 | May 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
General (Textual) |  |  |  |  |
Consolidated revenues percentage |  |  | 72.00% |  |
Total consideration | $ 30,206 | $ 21,279 |  | $ 30,206 | $ 21,279
Net of underwriting discounts, commissions and other offering expenses | $ 24,194 | 1,721 |  |  |
Sale of stock public offerings |  | $ 5,000 |  |  |
AT&T Engagement [Member] |  |  |  |  |
General (Textual) |  |  |  |  |
Pursuant to AT&T Engagement |  |  | $ 16,296 | $ 24,528 | $ 18,310
Consolidated revenues percentage |  |  | 48.00% | 66.00% | 62.00%
Total consideration |  |  |  |  |

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