Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of stock option activity

A summary of stock option activity for the six months ended June 30, 2013 is as follows:

	Stock Option Activity				Weighted-Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
	Number of Shares		Weighted-Average Exercise Price
Outstanding—December 31, 2012	8,251,850		$	10.50
Assumed options from acquisition	9,182		14.50
Granted	710,381		170.02
Exercised	(2,170,457	)	9.10
Canceled or expired	(166,991	)	12.34
Outstanding—June 30, 2013	6,633,965		$	28.00	6.95	$	997,105
Options vested and expected to vest as of June 30, 2013	6,306,705		$	25.00	6.87	$	966,837
Options vested and exercisable as of June 30, 2013	3,281,054		$	6.59	6.04	$	563,399

Summary of RSU activity

A summary of RSU activity for the six months ended June 30, 2013 is as follows:

	Number of Shares		Weighted- Average Grant Date Fair Value
Unvested—December 31, 2012	3,239,272		$	94.69
Granted	1,510,644		172.52
Vested and issued	(484,373	)	96.85
Canceled	(171,818	)	116.32
Unvested—June 30, 2013	4,093,725		$	122.25

Stock-based compensation related to stock-based awards to employees and nonemployees

The following table presents the amount of stock-based compensation related to stock-based awards to employees and nonemployees on the Company’s condensed consolidated statements of operations during the periods presented (in thousands):

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
Cost of revenue	$	3,913		$	1,236		$	6,719		$	2,037
Sales and marketing	8,843			4,327			15,704			7,195
Product development	24,885			10,572			42,523			16,461
General and administrative	10,713			3,188			17,347			6,256
Total stock-based compensation	48,354			19,323			82,293			31,949
Tax benefit from stock-based compensation	(13,465		)	(3,762		)	(22,754		)	(6,603		)
Total stock-based compensation, net of tax effect	$	34,889		$	15,561		$	59,539		$	25,346