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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (FV - Level 3) (Details) - Contingent Consideration - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Fair Value of liabilities level 3 hierarchy |  |
Balance beginning of period | $ 6,775 |
Contingent consideration liability recorded at fair value for business acquisition |  | $ 6,711
Change in fair value included in operating expenses | 195 | 64
Balance at end of period | $ 6,970 | $ 6,775

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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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