Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 48,092	$ 58,138
Restricted cash	30	30
Marketable securities	39,426	41,558
Accounts receivable, net	13,176	10,977
Prepaid expenses and other current assets	7,198	2,072
Deferred tax assets	1,204	1,204
Total current assets	109,126	113,979
Property and equipment, net	50,536	42,411
Goodwill	33,045	26,744
Intangible assets, net	16,060	10,594
Deferred tax assets	1,195	4,256
Other assets	3,113	4,548
Total assets	213,075	202,532
Current liabilities:
Accounts payable	5,555	4,990
Accrued expenses and other liabilities	13,552	11,019
Deferred revenue	21,653	17,329
Total current liabilities	40,760	33,338
Deferred revenue, net of current portion	22,796	24,123
Other liabilities	1,978	572
Total liabilities	65,534	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; 35,571 and 35,483 shares issued and outstanding at June 30, 2013 and December 31, 2012, respectively	4	4
Additional paid-in capital	184,115	178,219
Accumulated deficit	(37,129)	(34,547)
Total common stockholders' equity	146,990	143,676
Non-controlling interests	551	823
Total stockholders' equity	147,541	144,499
Total liabilities and stockholders' equity	$ 213,075	$ 202,532