Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2013

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

Summary of stock option activity

A summary of stock option activity for the three months ended March 31, 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
Granted	698,576		169.94
Exercised	(1,291,004	)	9.35
Canceled or expired	(115,766	)	12.94
Outstanding—March 31, 2013	7,543,656		$	25.43	7.15	$	1,136,374
Options vested and expected to vest as of March 31, 2013	7,131,220		$	22.48	7.07	$	1,095,246
Options vested and exercisable as of March 31, 2013	3,483,625		$	5.38	6.22	$	594,569

Summary of RSU activity

A summary of RSU activity for the three months ended March 31, 2013 is as follows:

	Number of Shares		Weighted- Average Grant Date Fair Value
Unvested—December 31, 2012	3,239,272		$	94.69
Granted	1,218,804		168.87
Vested and issued	(210,648	)	82.50
Canceled	(84,541	)	96.85
Unvested—March 31, 2013	4,162,887		$	116.98

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 March 31,
	2013			2012
Cost of revenue	$	2,806		$	801
Sales and marketing	6,861			2,868
Product development	17,638			5,889
General and administrative	6,634			3,068
Total stock-based compensation	33,939			12,626
Tax benefit from stock-based compensation	(9,289		)	(2,841		)
Total stock-based compensation, net of tax effect	$	24,650		$	9,785