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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 |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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