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Other Accounts Receivable and Prepaid Expenses (Tables)
 12 Months Ended
Dec. 31, 2018
Prepaid Expense and Other Assets [Abstract]  
Schedule of other accounts receivable and prepaid expenses
   December 31, 
   2018   2017 
         
Indirect taxes  $667   $980 
Grant receivables   10    740 
Prepaid expenses and advances to suppliers   752    460 
Others   337    505 
           
   $1,766   $2,685