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SIGNIFICANT ACCOUNTING POLICIES (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2019
Jan. 01, 2018
Short Term Bank Deposits Bear Interest Average Rate 2.37% 0.95%      
Restricted Short Term Deposits $ 7,374 $ 2,739      
Long Term Bank Deposits Bear Interest Average Rate 3.29% 2.05%      
Restricted Long Term Deposits $ 1,800 $ 4,207      
Antidilutive Securities and Outstanding Options, RSUs and Warrants Excluded from Computation of Earings Per Share, Amount 158,823 317,186 1,927,281    
Severance Cost $ 2,680 $ 2,631 $ 3,217    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 3.02 $ 3.05 $ 2.01    
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 308 $ 287 $ 286    
Advertising Expense $ 627 442 687    
Defined Contribution Plan, Description All eligible employees may elect to contribute a portion of their annual compensation to the plan through salary deferrals, subject to the IRS limit of $18 during the years ended December 31, 2017 and 2018, plus a catch-up contribution of $6 for participants age 50 or over. The Group matches 50% of employees’ contributions, up to a maximum of 6% of the employees' annual pay.        
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets         $ 180
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]          
Costs and Expenses $ 240        
Other Receivables And Prepaid Expenses [Member]          
Contract with Customer, Asset, Net 420        
Grant [Member]          
Revenue from Contract with Customer, Including Assessed Tax $ 5,734 8,290 $ 7,335    
Minimum [Member]          
Finite-Lived Intangible Asset, Useful Life 4 years 6 months        
Maximum [Member]          
Finite-Lived Intangible Asset, Useful Life 10 years        
Subsequent Event [Member]          
Operating Lease, Right-of-Use Asset       $ 30,000  
Operating Lease, Liability       $ 35,000  
Warranty Reserves [Member]          
Valuation Allowances and Reserves, Balance $ 323 339      
Allowance for Sales Returns [Member]          
Provision for Sales Return $ 2,272 $ 1,926