Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	[1]
CURRENT ASSETS:
Cash and cash equivalents	$ 158,691	$ 168,252
Short-term investments	100,054	96,555
Restricted cash	69	79
Accounts receivable, net of allowance of $1,595 and $ 1,438 as of March 31, 2016 and December 31, 2015, respectively	43,570	61,051
Inventory	860	815
Prepaid expenses and other current assets	9,476	7,965
Total current assets	312,720	334,717
Property and equipment, net	17,486	12,164
Goodwill	34,972	34,972
Acquired intangible assets, net	7,639	7,991
Severance pay fund	4,789	4,530
Restricted cash	1,665	1,665
Deferred tax assets	683	588
Other assets	1,157	1,042
TOTAL ASSETS	381,111	397,669
CURRENT LIABILITIES:
Accounts payable	7,772	6,870
Accrued compensation and benefits	17,195	20,259
Accrued and other current liabilities	6,462	14,283
Deferred revenue	82,119	79,132
Total current liabilities	113,548	120,544
Other liabilities	5,005	4,515
Deferred revenue	25,936	27,525
Accrued severance pay	5,454	4,884
TOTAL LIABILITIES	149,943	157,468
Commitments and Contingencies (Note 7)	0	0
STOCKHOLDERS' EQUITY:
Preferred stock, $0.0001 par value - 5,000,000 shares authorized, no shares issued and outstanding as of March 31, 2016 and December 31, 2015, respectively	0	0
Common stock, $0.0001 par value - 145,000,000 shares authorized, 32,259,601 and 31,837,144 shares issued and outstanding as of March 31, 2016 and December 31, 2015, respectively	3	3
Additional paid-in capital	461,958	448,069
Accumulated deficit	(230,547)	(206,540)
Accumulated other comprehensive loss	(246)	(1,331)
TOTAL STOCKHOLDERS' EQUITY	231,168	240,201
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 381,111	$ 397,669

[1] The Condensed Consolidated Balance Sheet as of December 31, 2015 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.