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Market Concentrations (Tables) | 12 Months Ended
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Dec. 31, 2018
Risks and Uncertainties [Abstract] |
Schedule of revenues concentration from major customers | Total revenues by customer for each customer representing 10% or more of consolidated revenues are summarized below for the years ended December 31:
|  | 2018 |  | 2017 |  | 2016
Customer 1 |  | 26% |  |  | 25% |  |  | 22% |
Customer 2 |  | 24% |  |  | 22% |  |  | 28% |
Customer 3 |  | 25% |  |  | 25% |  |  | 29% |
Customer 4 |  | *% |  |  | *% |  |  | 10% |
Customer 5 |  | 11% |  |  | *% |  | *%
*: less than 10% of total |  |  |  |  |  |

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