Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 29,672	$ 50,239
Marketable securities	126,265	196,474
Trade and other receivables, net	16,295	13,974
Prepaid expenses and other current assets	12,977	12,303
Total current assets	185,209	272,990
Property and equipment, net	43,882	30,485
Goodwill	172,087	172,087
Intangible assets, net	23,811	30,174
Deferred tax assets, net	89,691	77,363
Other non-current assets	14,119	9,710
Total assets	528,799	592,809
Current liabilities:
Accounts payable	7,672	24,747
Accrued expenses and other liabilities	85,712	76,226
Deferred revenue	196,776	166,403
Total current liabilities	290,160	267,376
Other non-current liabilities	18,172	7,367
Total liabilities	308,332	274,743
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.001 par value, 300,000,000 authorized at June 30, 2016 and December 31, 2015; 99,220,559 and 95,877,947 shares issued and 91,717,769 and 95,832,238 outstanding at June 30, 2016 and December 31, 2015, respectively	99	96
Preferred stock, $0.001 par value, 10,000,000 shares authorized and no shares issued and outstanding at June 30, 2016 and December 31, 2015	0	0
Treasury stock, at cost; 7,502,790 shares and no shares held at June 30, 2016 and December 31, 2015, respectively	(79,824)	0
Additional paid-in capital	533,069	532,388
Accumulated other comprehensive loss	(30)	(361)
Accumulated deficit	(232,847)	(214,057)
Total stockholders’ equity	220,467	318,066
Total liabilities and stockholders’ equity	$ 528,799	$ 592,809