Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011
Cash flows from operating activities:
Net income (loss)	$ (14,364)		$ 5,027
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	4,873		970
Amortization of premium/discount	98
Amortization of deferred commissions	5,344		2,381
Stock-based compensation	10,375		1,833
Tax benefit from exercise of stock options	(257)		(21)
Deferred income taxes	(174)
(Gain) loss on disposal of property and equipment	(1)		60
Changes in operating assets and liabilities:
Accounts receivable	(2,723)		(7,131)
Deferred commissions	(13,076)		(3,388)
Prepaid expenses and other current assets (1)	5,203	[1]	(2,312)	[1]
Other assets	(1,956)		(220)
Accounts payable	963		1,099
Accrued expenses and other current liabilities	1,985		3,869
Deferred rent	(58)		3,236
Deferred revenue	26,786		21,358
Other long-term liabilities			(4)
Net cash provided by operating activities	23,018		26,757
Cash flows from investing activities:
Purchases of property and equipment	(20,226)		(6,676)
Purchases of investments	(23,919)
Sale of investments	(1,025)
Restricted cash	8		150
Net cash used in investing activities	(43,112)		(6,526)
Cash flows from financing activities:
Proceeds from exercise of stock options	2,133		341
Proceeds from early exercise of stock options	1,024		643
Tax benefit from exercise of stock options	257		21
Net proceeds from issuance of common stock	17,848
Purchases of common stock and restricted stock from stockholders	(1,960)
Offering costs in connection with initial public offering	(1,164)
Net cash provided by financing activities	18,138		1,005
Foreign currency effect on cash	(650)		160
Net increase (decrease) in cash and cash equivalents	(2,606)		21,396
Cash at beginning of period	68,088		38,457
Cash and cash equivalents at end of period	65,482		59,853
Supplemental disclosures of other cash flow information:
Interest paid	2		4
Taxes paid	1,071		1,403
Non-cash investing and financing activities:
Property and equipment included in accounts payable and accrued expenses	5,723		756
Vesting of early exercised stock options	889		36
Accretion of preferred stock dividends and issuance costs	308		313
Deferred offering costs not yet paid	$ 2,154

[1] Includes $5.3 million payment received from the Company’s founder during the six months ended June 30, 2012. Refer to Note 8.