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SIGNIFICANT ACCOUNTING POLICIES - NARRATIVE (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Credit terms, billing term, lower limit 10 days    
Credit terms, billing term, upper limit 90 days    
Allowances for doubtful accounts $ 428 $ 204  
Shipping and handling costs 200 200 $ 200
Advertising Expense 400 600 700
Research and development costs 2,469 1,941 $ 1,033
Unrecognized tax benefits $ 1,313 $ 0