Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 34,885	$ 24,548
Short-term Investments	83,547	0
Accounts receivable, net of allowance of $331 and $230 at December 31, 2012 and 2011, respectively	24,545	20,750
Prepaid expenses and other current assets	4,377	3,774
Total current assets	147,354	49,072
Restricted cash	114	112
Property and equipment, net	18,148	13,861
Intangible assets, net	2,811	3,175
Goodwill	317	317
Other noncurrent assets	1,574	2,252
Total assets	170,318	68,789
Current Liabilities:
Accounts payable	2,031	2,254
Accrued liabilities	7,803	8,468
Deferred revenues, current	56,497	46,717
Capital lease obligations, current	1,183	1,987
Total current liabilities	67,514	59,426
Deferred revenues, noncurrent	8,616	4,713
Income taxes payable, noncurrent	594	661
Other noncurrent liabilities	1,231	2,134
Capital lease obligations, noncurrent	808	2,406
Total liabilities	78,763	69,340
Commitments and contingencies
Convertible preferred stock:
Convertible preferred stock	0	63,873
Stockholders' Equity (Deficit):
Preferred stock: $0.001 par value; 20,000,000 shares authorized, no shares issued and outstanding at December 31, 2012; no shares authorized, issued and outstanding at December 31, 2011	0	0
Common stock, $0.001 par value; 1,000,000,000 shares authorized, 31,420,028 shares issued and outstanding at December 31, 2012; 299,900,000 shares authorized, 5,300,288 shares issued and outstanding at December 31, 2011	31	5
Additional paid-in capital	166,651	12,927
Accumulated other comprehensive loss	(1,035)	(984)
Accumulated deficit	(74,092)	(76,372)
Total stockholders’ equity (deficit)	91,555	(64,424)
Total liabilities, convertible preferred stock and stockholders’ equity (deficit)	170,318	68,789
Series A convertible preferred stock: $0.001 par value; no shares authorized, issued and outstanding at December 31, 2012; 48,079,860 shares authorized, 4,766,543 shares issued and outstanding at December 31, 2011; aggregate liquidation preference—$0 and $28,774 at December 31, 2012 and 2011
Convertible preferred stock:
Convertible preferred stock	0	28,603
Series B convertible preferred stock: $0.001 par value; no shares authorized, issued and outstanding at December 31, 2012; 110,314,114 shares authorized, 11,031,387 shares issued and outstanding at December 31, 2011; aggregate liquidation preference—$0 and $28,862 at December 31, 2012 and 2011
Convertible preferred stock:
Convertible preferred stock	0	28,568
Series C convertible preferred stock: $0.001 par value; no shares authorized, issued and outstanding at December 31, 2012; 18,006,026 shares authorized, 1,799,328 shares issued and outstanding at December 31, 2011; aggregate liquidation preference— $0 and $6,631 at December 31, 2012 and 2011
Convertible preferred stock:
Convertible preferred stock	$ 0	$ 6,702