Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 7,954	$ 27,338
Restricted cash	545	545
Marketable securities	29,909	32,962
Accounts receivable, net	26,597	16,326
Prepaid expenses and other current assets	3,267	2,566
Deferred tax assets	1,192	1,192
Total current assets	69,464	80,929
Property and equipment, net	93,515	67,560
Goodwill	42,578	42,431
Intangible assets, net	21,549	23,413
Other assets	1,227	1,210
Total assets	228,333	215,543
Current liabilities:
Accounts payable	15,392	11,642
Accrued expenses and other liabilities	20,091	16,908
Deferred revenue	26,467	19,292
Total current liabilities	61,950	47,842
Deferred revenue, net of current portion	27,646	21,591
Deferred tax liabilities	3,599	3,369
Other liabilities	1,264	2,133
Total liabilities	94,459	74,935
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; 35,810 and 35,226 shares issued and outstanding at June 30, 2014 and December 31, 2013, respectively	4	4
Additional paid-in capital	185,643	182,927
Accumulated deficit	(52,370)	(43,188)
Total common stockholders' equity	133,277	139,743
Non-controlling interests	597	865
Total stockholders' equity	133,874	140,608
Total liabilities and stockholders' equity	$ 228,333	$ 215,543