Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 107,343	$ 168,252
Short-term investments	153,749	96,555
Restricted cash	68	79
Accounts receivable, net of allowance of $1,784 and $ 1,438 as of December 31, 2016 and 2015, respectively	62,571	61,051
Inventory	590	815
Prepaid expenses and other current assets	7,922	7,965
Total current assets	332,243	334,717
Property and equipment, net	21,496	12,164
Goodwill	37,448	34,972
Acquired intangible assets, net	8,393	7,991
Severance pay fund	5,070	4,530
Restricted cash	1,884	1,665
Deferred tax assets	1,220	588
Other assets	1,065	1,042
TOTAL ASSETS	408,819	397,669
CURRENT LIABILITIES:
Accounts payable	5,529	6,870
Accrued compensation and benefits	20,840	20,259
Accrued and other current liabilities	7,683	14,283
Deferred revenue	104,042	79,132
Total current liabilities	138,094	120,544
Other liabilities	6,637	4,515
Deferred revenue	26,429	27,525
Accrued severance pay	5,696	4,884
TOTAL LIABILITIES	176,856	157,468
Commitments and Contingencies (Note 11)
STOCKHOLDERS' EQUITY:
Preferred stock, $0.0001 par value - 5,000,000 shares authorized, no shares issued and outstanding as of December 31, 2016 and 2015, respectively	0	0
Common stock, $0.0001 par value - 145,000,000 shares authorized, 33,088,990 and 31,837,144 shares issued and outstanding as of December 31, 2016 and 2015, respectively	3	3
Additional paid-in capital	510,257	448,069
Accumulated deficit	(276,819)	(206,540)
Accumulated other comprehensive loss	(1,478)	(1,331)
TOTAL STOCKHOLDERS' EQUITY	231,963	240,201
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 408,819	$ 397,669