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Derivatives Instruments (Tables)
12 Months Ended
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of derivative instruments

 

   Line Item in Statement of Operations  Year ended December 31, 
      2018   2017   2016 
                
Derivatives designated as cash flow hedging instruments :               
Foreign currency derivatives  Cost of revenues  $18   $(63)  $- 
Foreign currency derivatives  Sales and marketing  $13   $(61)  $1 
Foreign currency derivatives  General and administrative  $6   $(24)  $- 
                   
Total expenses (income)     $37   $(148)  $1