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Other Accounts Receivable and Prepaid Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Prepaid Expense and Other Assets [Abstract]    
Indirect taxes $ 667 $ 980
Grant receivables 10 740
Prepaid expenses and advances to suppliers 752 460
Others 337 505
Other accounts receivable and prepaid expenses $ 1,766 $ 2,685