Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 123,911	$ 134,197
Marketable securities	48,688	0
Trade and other receivables, net	10,906	7,560
Deferred tax assets, net	13,117	0
Prepaid expenses and other current assets	6,961	5,753
Total current assets	203,583	147,510
Property and equipment, net	16,504	9,701
Goodwill	159,342	129,428
Intangible assets, net	47,213	51,242
Deferred tax assets, net - noncurrent	33,211	0
Other non-current assets	1,812	1,707
Total assets	461,665	339,588
Current liabilities:
Accounts payable	2,422	1,151
Accrued expenses and other liabilities	34,926	27,329
Deferred revenue	119,106	90,877
Total current liabilities	156,454	119,357
Other non-current liabilities	4,640	265
Total liabilities	161,094	119,622
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.001 par value, 300,000,000 authorized at December 31, 2013 and December 31, 2012; 91,441,771 and 86,561,320 shares issued and outstanding at December 31, 2013 and December 31, 2012, respectively	91	87
Preferred stock, $0.001 par value, 10,000,000 shares authorized and no shares issued and outstanding at December 31, 2013 and December 31, 2012	0	0
Additional paid-in capital	466,047	439,883
Accumulated other comprehensive loss	(18)	0
Accumulated deficit	(165,549)	(220,004)
Total stockholders’ equity	300,571	219,966
Total liabilities and stockholders’ equity	$ 461,665	$ 339,588