Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 50,239	$ 146,569
Marketable securities	196,474	127,305
Trade and other receivables, net	13,974	10,220
Deferred tax assets, net	0	21,243
Prepaid expenses and other current assets	12,303	7,841
Total current assets	272,990	313,178
Property and equipment, net	30,485	24,204
Goodwill	172,087	159,342
Intangible assets, net	30,174	38,315
Deferred tax assets, net – non-current	77,363	22,494
Other non-current assets	9,710	5,783
Total assets	592,809	563,316
Current liabilities:
Accounts payable	24,747	11,543
Accrued expenses and other liabilities	76,226	67,025
Deferred revenue	166,403	145,206
Total current liabilities	267,376	223,774
Other non-current liabilities	7,367	6,706
Total liabilities	$ 274,743	$ 230,480
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.001 par value, 300,000,000 authorized at December 31, 2015 and December 31, 2014; 95,877,947 and 93,944,742 shares issued and 95,832,238 and 93,899,968 outstanding at December 31, 2015 and December 31, 2014, respectively	$ 96	$ 94
Preferred stock, $0.001 par value, 10,000,000 shares authorized and no shares issued and outstanding at December 31, 2015 and December 31, 2014	0	0
Additional paid-in capital	532,388	495,912
Accumulated other comprehensive loss	(361)	(116)
Accumulated deficit	(214,057)	(163,054)
Total stockholders’ equity	318,066	332,836
Total liabilities and stockholders’ equity	$ 592,809	$ 563,316