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Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2014
Equity [Abstract]  
Stock Option Activity under Stock Plans
The following table summarizes the stock option activity under the Stock Plans during the nine months ended September 30, 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
(5,015
)
 
0.91

 
 
 
 
Balance as of September 30, 2014
17,087

 
$
4.34

 
3.22
 
$
1,276

Stock options vested and expected to vest as of September 30, 2014
17,071

 
$
4.33

 
3.22
 
$
1,275

Stock options exercisable as of September 30, 2014
13,719

 
$
2.48

 
2.56
 
$
1,050

(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 $79.04 on September 30, 2014.
Restricted Stock Units Award Activity
The following table summarizes the activities for our unvested RSUs for the nine months ended September 30, 2014:
 
Unvested RSUs
 
Number of Shares
 
Weighted Average Grant Date Fair Value
 
(in thousands)
 
 
Unvested at December 31, 2013
103,971

 
$
27.30

Granted
33,844

 
70.04

Vested
(33,450
)
 
24.77

Forfeited
(7,948
)
 
33.87

Unvested at September 30, 2014
96,417

 
$
42.64