Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 156,029	$ 146,569
Marketable securities	169,923	127,305
Trade and other receivables, net	11,362	10,220
Deferred tax assets, net	26,952	21,243
Prepaid expenses and other current assets	8,494	7,841
Total current assets	372,760	313,178
Property and equipment, net	24,128	24,204
Goodwill	159,342	159,342
Intangible assets, net	34,148	38,315
Deferred tax assets, net – non-current	22,494	22,494
Other non-current assets	9,815	5,783
Total assets	622,687	563,316
Current liabilities:
Accounts payable	18,881	11,543
Accrued expenses and other liabilities	73,924	67,025
Deferred revenue	179,656	145,206
Total current liabilities	272,461	223,774
Other non-current liabilities	7,082	6,706
Total liabilities	$ 279,543	$ 230,480
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.001 par value, 300,000,000 authorized at June 30, 2015 and December 31, 2014; 95,163,335 and 93,944,742 shares issued and 95,117,726 and 93,899,968 outstanding at June 30, 2015 and December 31, 2014, respectively	$ 95	$ 94
Preferred stock, $0.001 par value, 10,000,000 shares authorized and no shares issued and outstanding at June 30, 2015 and December 31, 2014	0	0
Additional paid-in capital	514,934	495,912
Accumulated other comprehensive loss	(194)	(116)
Accumulated deficit	(171,691)	(163,054)
Total stockholders’ equity	343,144	332,836
Total liabilities and stockholders’ equity	$ 622,687	$ 563,316