Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 107,218	$ 112,644
Accounts receivable, net of allowances of $557 and $393 for 2015 and 2014 respectively	50,678	37,867
Prepaid expenses and other current assets	9,073	5,756
Total current assets	166,969	156,267
Property and equipment, net	21,323	16,832
Goodwill	29,201	29,201
Intangible assets, net	5,455	7,076
Other assets	2,130	1,035
Total assets	225,078	210,411
Current liabilities:
Accounts payable	4,265	3,901
Accrued expenses and other current liabilities	25,706	20,691
Deferred revenue	91,735	62,945
Current portion of credit facility	2,174	2,719
Total current liabilities	123,880	90,256
Credit facility, net of current portion	478	2,653
Deferred revenue, long-term	230
Other liabilities	2,722	3,526
Total liabilities	$ 127,310	$ 96,435
Commitments and contingencies (Note 8)
Redeemable non-controlling interests	$ 4,643	$ 800
Stockholder's equity:
Common stock, par value $0.0001 per share - 1,000,000 shares authorized as of December 31, 2015 and 2014; 43,606 and 41,481 shares issued and outstanding as of December 31, 2015 and 2014, respectively	4	4
Additional paid-in capital	344,727	297,420
Accumulated other comprehensive loss	(274)	(350)
Accumulated deficit	(251,332)	(183,898)
Total stockholders' equity	93,125	113,176
Total liabilities, redeemable non-controlling interests and stockholders' equity	$ 225,078	$ 210,411