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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounting Policies [Abstract]      
Trade receivables, allowances for doubtful accounts $ 9 $ 0  
Bad debt expense 0 0 $ 0
Inventory write offs $ 498 346 187
Additional inventory write-down     1,005
Percentage of marketing expenses for which entity receive grants 50.00%    
Grants received presented as a reduction in marketing expenses $ 75 $ 215 $ 55
Shares excluded from the calculation of diluted net income (loss) per share   1,349,414 1,368,220
Uncertain tax position, likelihood of being sustained, threshold for recognition 50.00%    
Years employment required for eligibility for severance pay 1 year    
Months severance salary payable per year of employment 1 month    
Severance pay expenses $ 905 $ 485 $ 527