Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 118,989	$ 68,088
Restricted cash	0	45
Short-term investments	195,702	0
Accounts receivable, net	78,163	44,860
Current portion of deferred commissions	14,979	6,087
Prepaid expenses and other current assets	13,596	9,883
Current portion of deferred tax assets	660	1,544
Total current assets	422,089	130,507
Deferred commissions, less current portion	11,296	4,597
Property and equipment, net	42,342	20,695
Other assets	2,387	524
Total assets	478,114	156,323
Current liabilities:
Accounts payable	9,604	9,411
Accrued expenses and other current liabilities	48,042	25,608
Current portion of deferred revenue	153,964	91,087
Current portion of deferred rent	17	455
Total current liabilities	211,627	126,561
Deferred revenue, less current portion	16,397	13,549
Deferred rent, less current portion	1,148	2,935
Other long-term liabilities	5,537	2,532
Total liabilities	234,709	145,577
Commitments and contingencies
Convertible preferred stock:
Convertible preferred stock, $0.001 par value; no shares authorized, issued and outstanding at December 31, 2012 and 11,354,473 shares authorized; 10,462,877 issued and outstanding at December 31, 2011; liquidation preference of $68,610 at December 31, 2011	0	68,172
Stockholders’ equity (deficit):
Preferred stock, $0.001 par value; 10,000,000 shares authorized; no shares issued or outstanding	0	0
Common stock $0.001 par value; 600,000,000 shares authorized; 126,367,700 and 22,229,978 shares issued and outstanding at December 31, 2012 and 2011, respectively	126	22
Additional paid-in capital	348,803	9,793
Accumulated other comprehensive income (loss)	(36)	899
Accumulated deficit	(105,488)	(68,140)
Total stockholders’ equity (deficit)	243,405	(57,426)
Total liabilities, convertible preferred stock and stockholders’ equity (deficit)	$ 478,114	$ 156,323