Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013	Dec. 31, 2012		Jun. 30, 2011
Cash flows from operating activities:
Net income (loss)	$ (6,684)	$ 4,803	$ (73,708)	$ (37,348)		$ 9,830
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	2,045	502	24,152	13,506		1,472
Amortization of premiums on investments	0	0	4,758	1,337		0
Amortization of deferred commissions	3,492	1,642	29,364	13,710		4,023
Amortization of debt discount and issuance costs	0	0	3,498	0		0
Share-based Compensation	5,637	1,121	65,581	27,937		2,954
Tax benefit from employee stock plans	(41)	(117)	(1,658)	(1,694)		(138)
Deferred income tax	0	0	(231)	(746)		0
Other	72	0	558	2,850		60
Changes in operating assets and liabilities:
Accounts receivable	(20,365)	(7,631)	(29,506)	(33,341)		(14,762)
Deferred commissions	(8,313)	(2,180)	(54,943)	(29,175)		(5,568)
Prepaid expenses and other assets	(1,445)	(648)	3,471	(2,904)	[1]	(3,180)
Accounts payable	1,490	(845)	(252)	4,887		254
Deferred revenue	29,990	12,557	94,405	64,845		33,915
Accrued expenses and other liabilities	7,342	1,507	16,257	24,902		8,608
Net cash provided by operating activities	13,220	10,711	81,746	48,766		37,468
Cash flows from investing activities:
Purchases of property and equipment	(7,959)	(2,057)	(55,321)	(42,066)		(8,733)
Acquisition, net of cash acquired	0	0	(13,330)	0		0
Purchases of investments	0	0	(570,679)	(240,626)		0
Sale of investments	0	0	(55,158)	(1,025)		0
Maturities of investments	0	0	181,554	42,473		0
Restricted cash	0	200	(177)	45		350
Net cash used in investing activities	(7,959)	(1,857)	(402,795)	(239,149)		(8,383)
Cash flows from financing activities:
Net proceeds from initial public offering	0	0	0	169,784		0
Net proceeds from (offering costs paid in connection with) follow-on offering	0	0	(698)	50,561		0
Net proceeds from borrowings on convertible senior notes	0	0	562,941	0		0
Proceeds from issuance of warrants	0	0	84,525	0		0
Purchase of convertible note hedge	0	0	(135,815)	0		0
Proceeds from employee stock plans			55,959
Proceeds from employee stock plans	2,128	105		3,912		1,089
Tax benefit from employee stock plans	41	117	1,658	1,694		138
Net proceeds from issuance of common stock	0	0	0	17,848		0
Purchases of common stock and restricted stock from stockholders	(15)	0	0	(1,960)		0
Net cash provided by financing activities	2,154	222	568,570	241,839		1,227
Foreign currency effect on cash and cash equivalents	820	(21)	(207)	(555)		139
Net increase in cash and cash equivalents	8,235	9,055	247,314	50,901		30,451
Cash and cash equivalents at beginning of period	59,853	29,402	118,989	68,088		29,402
Cash and cash equivalents at end of period	68,088	38,457	366,303	118,989		59,853
Supplemental disclosures of other cash flow information:
Taxes paid	360	0	920	1,524		1,403
Non-cash investing and financing activities:
Conversion of preferred stock to common stock	0	0	0	68,480		0
Property and equipment included in accounts payable and accrued expenses	6,296	369	3,741	1,234		756
Exercise of stock options included in prepaid and other assets	0	0	10	1,089		0
Offering costs not yet paid	$ 0	$ 0	$ 0	$ 711		$ 0

[1] Includes $5.3 million payment received from our founder during the year ended December 31, 2012. Refer to Note 16.