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SIGNIFICANT ACCOUNTING POLICIES - Share based compensation expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Total stock-based compensation expenses $ 5,292 $ 3,287 $ 2,307
Cost of Sales [Member]      
Total stock-based compensation expenses 183 186 84
Research and Development Expense [Member]      
Total stock-based compensation expenses 937 651 383
Selling and Marketing Expense [Member]      
Total stock-based compensation expenses 2,171 1,238 1,024
General and Administrative Expense [Member]      
Total stock-based compensation expenses $ 2,001 $ 1,212 $ 816