SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Property Plant And Equipment Estimated Useful Lives [Table Text Block]

Depreciation is calculated by the straight-line method over the estimated useful lives of the assets, at the following annual rates:

Computers and peripheral equipment	33%
Office furniture and equipment	6% – 20% (mainly 15%)
Leasehold improvements	Over the shorter of the term of the lease or the useful life of the asset

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

The components of AOCI were as follows:

	Unrealized gains (losses) on available- for-sale marketable securities		Unrealized gains (losses) on cash flow hedges		Total
Balance as of January 1, 2017	$	(61)	$	(142)	$	(203)
Other comprehensive income before reclassifications		17		1,739		1,756
Amounts reclassified from AOCI		-		(1,597)		(1,597)
Other comprehensive income (loss)		17		142		159
Balance as of December 31, 2017	$	(44)	$	-	$	(44)

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Fair values were estimated using the following weighted-average assumptions (annualized percentages):

	Year Ended December 31,
	2015		2016		2017
Dividend yield		0%		0%		0%
Expected volatility		53.32%-55.86%		47.64%-52.95%		41.78%-47.25%
Risk-free interest		1.14%-1.74%		1.11%-1.86%		1.81%-2.14%
Expected life		4.75-5.43 years		4.76-5.30 years		4.77-5.28 years

Schedule Of Equity Based Compensation Expenses [Table Text Block]

The total share-based compensation expenses relating to all of the Company's share-based awards recognized for the years ended December 31, 2015, 2016 and 2017 were included in items of the consolidated statements of operations, as follows:

	Year Ended December 31,
	2015		2016		2017
Cost of revenues	$	101	$	118	$	84
Research and development expenses, net		429		459		383
Selling and marketing expenses		1,061		1,101		1,024
General and administrative expenses		782		736		816
Total share-based compensation expenses	$	2,373	$	2,414	$	2,307