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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Stock Option Activity under Stock Plans
The following table summarizes the activities of stock option awards under the Stock Plans for the year ended December 31, 2017:
 
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, 2016
5,687

 
$
7.78

 
 
 
 
Stock options exercised
(2,609
)
 
5.10

 
 
 
 
Balance as of December 31, 2017
3,078

 
$
10.06

 
2.4
 
$
512

Stock options exercisable as of December 31, 2017
2,765

 
$
9.50

 
2.3
 
$
462

 
(1)
The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying stock option awards and the official closing price of our Class A common stock of $176.46, as reported on the Nasdaq Global Select Market on December 31, 2017.
Outstanding and Exercisable Options Under Stock Plans
The following table summarizes additional information regarding outstanding and exercisable options under the Stock Plans at December 31, 2017:
 
 
Options Outstanding 
 
Options Exercisable 
Exercise Price
 
Number of Shares
 
Weighted Average Remaining
Contractual Term
 
Weighted Average Exercise Price 
 
Number of Shares 
 
Weighted Average Exercise Price 
 
 
(in thousands)
 
(in years)
 
 
 
(in thousands)
 
 
$1.85
 
27
 
1.0
 
$
1.85

 
27

 
$
1.85

$2.95
 
851
 
1.6
 
2.95

 
851

 
2.95

$10.39
 
1,000
 
2.6
 
10.39

 
1,000

 
10.39

$15.00
 
1,200
 
2.8
 
15.00

 
887

 
15.00

 
 
3,078
 
2.4
 
$
10.06

 
2,765

 
$
9.50

Restricted Stock Units Award Activity
The following table summarizes the activities for our unvested RSUs for the year ended December 31, 2017:
 
Unvested RSUs(1)
 
Number of Shares
 
Weighted Average Grant Date Fair Value
 
(in thousands)
 
 
Unvested at December 31, 2016
98,586

 
$
82.99

Granted
36,741

 
147.28

Vested
(43,176
)
 
83.74

Forfeited
(10,937
)
 
91.76

Unvested at December 31, 2017
81,214

 
$
110.49


(1)
Unvested shares include inducement awards issued in connection with the WhatsApp acquisition in 2014 and are subject to the terms, restrictions, and conditions of separate non-plan RSU award agreements.