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Market Concentrations (Tables)
 12 Months Ended
Dec. 31, 2017
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:
 
 
2017
 
2016
 
2015
 
 
 
 
 
 
 
Customer 1
 
25%
 
22%
 
22%
Customer 2
 
22%
 
28%
 
28%
Customer 3
 
25%
 
29%
 
32%
Customer 4
 
*%
 
10%
 
*%
 
 
 
 
 
 
 
*: less than 10% of total