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Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2017
Significant Accounting Policies [Abstract]  
Schedule of reconciliation of the redeemable non-controlling interests
 January 1, 2017 $25,998 
 Net income attributable to redeemable non-controlling interest  1,536 
 Redeemable non-controlling interests reclassification to non-controlling interests  (2,440)
 Dividend in redeemable non-controlling interest  (1,726)
 Foreign currency translation adjustments  2,471 
      
 December 31, 2017 $25,839 
Schedule of property and equipment, net

  Years
   
 Computers and peripheral equipment3 - 5
 Office furniture and equipment7 - 15 (mainly 7)
 Motor vehicles7
 Software3 – 5 (mainly 5)
Schedule of stock-based compensation expense related to employee stock options
   Year ended December 31, 
   2015  2016  2017 
           
 Cost of revenue $31  $15  $7 
 Research and development  48   17   8 
 Selling and marketing  137   71   - 
 General and administrative  18   49   63 
              
 Total stock-based compensation expense $234  $152  $78 
Schedule of gains and losses of related hedged items
   Statements 

Gain recognized in the

statements of income

 
   of Year ended December 31, 
   income item 2015  2016  2017 
             
 Derivatives not designated as hedging:           
 Foreign exchange forward contracts “Financial income (expense), net”  69   4   (5)
                
 Total derivatives   $69  $4  $(5)