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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Significant Accounting Policies [Line Items]      
Income tax benefit realization threshold 50.00%    
Warranty expense $ 437 $ 252 $ 139
Warranty provision 2,023 2,460  
Trade receivables sold 19,797 14,306  
Accrued severance pay 7,962 6,825  
Financial expense related to factoring arrangements 553 536 759
Severance expense $ 1,852 $ 1,662 $ 2,130
Outstanding options excluded from the calculations of diluted net earnings per share due to their anti-dilutive effect 4,668,032 3,848,290 5,679,468
Impairment of long lived assets
Net increase to opening retained earnings 91    
Increase in trade receivables 131    
Increase in trade payables $ 40    
Technology and Customer Relations Intangible Assets [Member]      
Significant Accounting Policies [Line Items]      
Intangible assets useful lives 7 years    
Maximum [Member]      
Significant Accounting Policies [Line Items]      
Warranty period 3 years    
Minimum [Member]      
Significant Accounting Policies [Line Items]      
Warranty period 1 year