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Derivatives Instruments (Tables)
 12 Months Ended
Dec. 31, 2017
Derivatives Instruments [Abstract]  
Schedule of derivative instruments
   Line Item in Statement of Operations Year ended December 31, 
     2017  2016  2015 
             
 Derivatives designated as cash flow hedging instruments :              
 Foreign currency derivatives Cost of revenues $(63) $-  $32 
 Foreign currency derivatives Sales and marketing $(61) $1  $60 
 Foreign currency derivatives General and administrative $(24) $-  $32 
                
 Total expenses (income)   $(148) $1  $124