Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues:
Licenses	$ 123,610	$ 92,873	$ 71,273
Maintenance and services	93,754	71,583	55,937
Total revenues	217,364	164,456	127,210
Cost of revenues	20,873	15,843	12,019
Gross profit	196,491	148,613	115,191
Operating costs and expenses:
Research and development	47,369	36,660	31,792
Sales and marketing	135,896	107,825	86,367
General and administrative	26,823	19,822	16,106
Total operating expenses	210,088	164,307	134,265
Operating loss	(13,597)	(15,694)	(19,074)
Financial income (expenses), net	2,362	(885)	(1,523)
Loss before income taxes	(11,235)	(16,579)	(20,597)
Income taxes	(2,459)	(1,131)	(686)
Net loss	$ (13,694)	$ (17,710)	$ (21,283)
Net loss per share of common stock, basic and diluted (in dollars per share)	$ (0.50)	$ (0.67)	$ (0.84)
Weighted average number of shares used in computing net loss per share of common stock, basic and diluted (in shares)	27,467,440	26,406,312	25,198,546