Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 119,714	$ 128,299
Accounts receivable, net of allowances	29,648	26,946
Prepaid expenses and other current assets	5,569	3,218
Total current assets	154,931	158,463
Property and equipment, net	15,489	13,856
Goodwill	26,045	25,941
Intangible assets, net	6,509	7,095
Other assets	921	484
Total assets	203,895	205,839
Current liabilities:
Accounts payable	3,560	3,527
Accrued expenses and other current liabilities	17,839	23,055
Deferred revenue	53,161	41,356
Current portion of credit facility	2,664	2,187
Total current liabilities	77,224	70,125
Credit facility, net of current portion	4,026	5,372
Other liabilities	1,792	1,900
Total liabilities	83,042	77,397
Commitments and contingencies (Note 8)
Redeemable non-controlling interests	1,433
Stockholder's equity:
Common stock	4	4
Additional paid-in capital	274,353	257,801
Accumulated other comprehensive income	245	198
Accumulated deficit	(155,182)	(129,561)
Total stockholders' equity	119,420	128,442
Total liabilities, redeemable non-controlling interests and stockholders' equity	$ 203,895	$ 205,839