Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 110,445	$ 112,644
Accounts receivable, net of allowances	45,744	37,867
Prepaid expenses and other current assets	7,801	5,756
Total current assets	163,990	156,267
Property and equipment, net	20,661	16,832
Goodwill	29,201	29,201
Intangible assets, net	6,933	7,076
Other assets	2,101	1,035
Total assets	222,886	210,411
Current liabilities:
Accounts payable	5,453	3,901
Accrued expenses and other current liabilities	23,680	20,691
Deferred revenue	80,620	62,945
Current portion of credit facility	2,643	2,719
Total current liabilities	112,396	90,256
Credit facility, net of current portion	1,382	2,653
Other liabilities	3,962	3,526
Total liabilities	$ 117,740	$ 96,435
Commitments and contingencies (Note 8)
Redeemable non-controlling interests (Note 2 and Note 6)	$ 2,246	$ 800
Stockholders' equity:
Common stock	4	4
Additional paid-in capital	322,372	297,420
Accumulated other comprehensive loss	(382)	(350)
Accumulated deficit	(219,094)	(183,898)
Total stockholders' equity	102,900	113,176
Total liabilities, redeemable non-controlling interests and stockholders' equity	$ 222,886	$ 210,411