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SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524 + Details
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