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Selling and Marketing Expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Selling And Marketing Expenses      
Payroll and related expenses $ 2,801 $ 1,567 $ 695
Share-based payment 123 573 771
Professional fees 1,118 823 741
Marketing 699 490 353
Other 801 598 332
Total $ 5,542 $ 4,051 $ 2,892