Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2014

The following table summarizes the stock option activity under the Stock Plans during the three months ended March 31, 2014:



	Shares Subject to Options Outstanding
	Number of Shares		Weighted Average Exercise Price		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value⁽¹⁾
	(in thousands)				(in years)	(in millions)
Balance as of December 31, 2013	22,102		$	3.56
Stock options exercised	(2,705	)	0.32
Balance as of March 31, 2014	19,397		$	4.01	4.60	$	1,091
Stock options vested and expected to vest as of March 31, 2014	19,378		$	4.01	4.60	$	1,090
Stock options exercisable as of March 31, 2014	14,911		$	2.06	4.10	$	868


(1)	The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying stock option awards and the closing price of our Class A common stock of $60.24 on March 31, 2014.

The following table summarizes the activities for our unvested RSUs for the three months ended March 31, 2014:



	Unvested RSUs
	Number of Shares		Weighted Average Grant Date Fair Value
	(in thousands)
Unvested at December 31, 2013	103,971		$	27.30
Granted	19,523		68.13
Vested	(14,550	)	24.53
Forfeited	(2,575	)	31.55
Unvested at March 31, 2014	106,369		$	35.07