Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 46,648	$ 58,138
Restricted cash	30	30
Marketable securities	45,224	41,558
Accounts receivable, net	13,413	10,977
Prepaid expenses and other current assets	7,015	2,072
Deferred tax assets	1,204	1,204
Total current assets	113,534	113,979
Property and equipment, net	49,013	42,411
Goodwill	33,045	26,744
Intangible assets, net	16,543	10,594
Deferred tax assets	1,195	4,256
Other assets	2,835	4,548
Total assets	216,165	202,532
Current liabilities:
Accounts payable	5,132	4,990
Accrued expenses and other liabilities	12,777	11,019
Deferred revenue	21,824	17,329
Total current liabilities	39,733	33,338
Deferred revenue, net of current portion	26,549	24,123
Other liabilities	2,096	572
Total liabilities	68,378	58,033
Commitments and contingencies (Note 9)
Stockholders' equity:
Preferred stock, $0.0001 par value, 5,000 shares authorized, no shares issued and outstanding
Common stock, $0.0001 par value; 100,000 shares authorized, 35,650 and 35,483 shares issued and outstanding at March 31, 2013 and December 31, 2012, respectively	4	4
Additional paid-in capital	183,074	178,219
Accumulated deficit	(35,668)	(34,547)
Total common stockholders' equity	147,410	143,676
Non-controlling interests	377	823
Total stockholders' equity	147,787	144,499
Total liabilities and stockholders' equity	$ 216,165	$ 202,532