Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 58,138	$ 93,933
Restricted cash	30	465
Marketable securities	41,558	0
Accounts receivable, net of allowances of $179 and $177 in 2012 and 2011, respectively	10,977	7,382
Prepaid expenses and other current assets	2,072	1,103
Deferred tax assets	1,204	2,366
Total current assets	113,979	105,249
Property and equipment, net	42,411	39,717
Goodwill	26,744	25,512
Intangible assets, net	10,594	9,846
Deferred tax assets	4,256	4,083
Other assets	4,548	4,513
Total assets	202,532	188,920
Current liabilities:
Accounts payable	4,990	4,573
Accrued expenses and other liabilities	10,977	12,759
Deferred revenue	17,329	13,575
Current portion of capital leases	42	205
Total current liabilities	33,338	31,112
Deferred revenue, net of current portion	24,123	27,754
Long-term portion of capital leases	136	197
Other liabilities	436	778
Total liabilities	58,033	59,841
Commitments and contingencies (Note 12)
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, 35,483 and 33,584 shares issued and outstanding for 2012 and 2011, respectively	4	3
Additional paid-in capital	178,219	170,721
Accumulated deficit	(34,547)	(41,842)
Total common stockholders' equity	143,676	128,882
Non-controlling interests	823	197
Total stockholders' equity	144,499	129,079
Total liabilities and stockholders' equity	$ 202,532	$ 188,920