Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 44,746	$ 58,138
Restricted cash	30	30
Marketable securities	36,493	41,558
Accounts receivable, net	13,034	10,977
Prepaid expenses and other current assets	6,680	2,072
Deferred tax assets	1,199	1,204
Total current assets	102,182	113,979
Property and equipment, net	54,605	42,411
Goodwill	33,045	26,744
Intangible assets, net	15,522	10,594
Deferred tax assets	1,195	4,256
Other assets	3,262	4,548
Total assets	209,811	202,532
Current liabilities:
Accounts payable	6,478	4,990
Accrued expenses and other liabilities	11,756	11,019
Deferred revenue	17,908	17,329
Total current liabilities	36,142	33,338
Deferred revenue, net of current portion	24,903	24,123
Other liabilities	1,913	572
Total liabilities	62,958	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; 35,495 and 35,483 shares issued and outstanding at September 30, 2013 and December 31, 2012, respectively	4	4
Additional paid-in capital	184,417	178,219
Accumulated deficit	(38,269)	(34,547)
Total common stockholders' equity	146,152	143,676
Non-controlling interests	701	823
Total stockholders' equity	146,853	144,499
Total liabilities and stockholders' equity	$ 209,811	$ 202,532