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STOCK OPTIONS - ALLOCATION OF STOCK COMPENSATION EXPENSE (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated stock based compensation expense $ 1,525 $ 871 $ 809
Cost of sales      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated stock based compensation expense 0 0 2
Research and development      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated stock based compensation expense 25 27 27
Salaries and related costs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated stock based compensation expense $ 1,500 $ 844 $ 780