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Derivatives Instruments (Tables)
 12 Months Ended
Dec. 31, 2016
Derivatives Instruments [Abstract]  
Schedule of derivative instruments

 

   Line Item in Statement of Operations Year ended December 31, 
     2016  2015  2014 
             
 Derivatives designated as cash flow hedging instruments :           
 Foreign currency derivatives Cost of revenues $-  $32  $- 
 Foreign currency derivatives Sales and marketing $1  $60  $- 
 Foreign currency derivatives General and administrative $-  $32  $- 
                
 Total expenses   $1  $124  $-