Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash	$ 25,804	$ 24,548
Accounts receivable, net of allowance of $355 and $230 as of September 30, 2012 and December 31, 2011, respectively	23,452	20,750
Prepaid expenses and other current assets	6,502	3,774
Total current assets	55,758	49,072
Restricted cash	112	112
Property and equipment, net	16,896	13,861
Intangible assets, net	2,869	3,175
Goodwill	317	317
Other noncurrent assets	1,884	2,252
Total assets	77,836	68,789
Current Liabilities:
Accounts payable	1,715	2,254
Accrued liabilities	9,085	8,468
Deferred revenues, current	51,693	46,717
Capital lease obligations, current	1,556	1,987
Total current liabilities	64,049	59,426
Deferred revenues, noncurrent	6,152	4,713
Income taxes payable, noncurrent	504	661
Other noncurrent liabilities	1,189	2,134
Capital lease obligations, noncurrent	1,074	2,406
Total liabilities	72,968	69,340
Commitments and contingencies (Note 6)
Convertible preferred stock:
Convertible preferred stock	63,873	63,873
Stockholders' Equity (Deficit):
Common stock, $0.001 par value; 299,900,000 shares authorized; — 5,964,621 and 5,300,288 shares issued and outstanding at September 30, 2012 and December 31, 2011, respectively	6	5
Additional paid-in capital	17,257	12,927
Accumulated other comprehensive loss	(1,001)	(984)
Accumulated deficit	(75,267)	(76,372)
Total stockholders' equity (deficit)	(59,005)	(64,424)
Total liabilities, convertible preferred stock and stockholders' equity (deficit)	77,836	68,789
Series A convertible preferred stock: $0.001 par value; 48,079,860 shares authorized; 4,766,543 shares issued and outstanding at September 30, 2012 and December 31, 2011; aggregate liquidation preference-$28,774
Convertible preferred stock:
Convertible preferred stock	28,603	28,603
Series B convertible preferred stock: $0.001 par value; 110,314,114 shares authorized; 11,031,387 shares issued and outstanding at September 30, 2012 and December 31, 2011; aggregate liquidation preference—$28,862
Convertible preferred stock:
Convertible preferred stock	28,568	28,568
Series C convertible preferred stock: $0.001 par value; 18,006,026 shares authorized; 1,799,328 shares issued and outstanding at September 30, 2012 and December 31, 2011; aggregate liquidation preference— $6,631
Convertible preferred stock:
Convertible preferred stock	$ 6,702	$ 6,702