Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 13,516	$ 27,338
Restricted cash	545	545
Marketable securities	37,286	32,962
Accounts receivable, net	18,045	16,326
Prepaid expenses and other current assets	2,479	2,566
Deferred tax assets	1,192	1,192
Total current assets	73,063	80,929
Property and equipment, net	76,445	67,560
Goodwill	42,431	42,431
Intangible assets, net	22,483	23,413
Other assets	1,285	1,210
Total assets	215,707	215,543
Current liabilities:
Accounts payable	8,748	11,642
Accrued expenses and other liabilities	17,909	16,908
Deferred revenue	22,303	19,292
Total current liabilities	48,960	47,842
Deferred revenue, net of current portion	26,258	21,591
Deferred tax liabilities	3,369	3,369
Other liabilities	1,372	2,133
Total liabilities	79,959	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; 35,516 and 35,226 shares issued and outstanding at March 31, 2014 and December 31, 2013, respectively	4	4
Additional paid-in capital	183,988	182,927
Accumulated deficit	(48,636)	(43,188)
Total common stockholders' equity	135,356	139,743
Non-controlling interests	392	865
Total stockholders' equity	135,748	140,608
Total liabilities and stockholders' equity	$ 215,707	$ 215,543