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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Stock Option Transactions

Stock option transactions during the year ended December 31, 2017 are presented below:

 

 

 

Number of

Shares

 

 

Weighted-

Average

Exercise

Price

 

 

Weighted-

Average

Remaining

Contractual

Term

(years)

 

 

Aggregate

Intrinsic Value

(in thousands)

 

Outstanding at December 31, 2016

 

 

12,743,877

 

 

$

26.41

 

 

 

 

 

 

 

 

 

Granted

 

 

7,867,683

 

 

$

34.73

 

 

 

 

 

 

 

 

 

Exercised

 

 

(1,442,411

)

 

$

18.49

 

 

 

 

 

 

 

 

 

Cancelled/forfeited

 

 

(1,225,713

)

 

$

30.48

 

 

 

 

 

 

 

 

 

Outstanding at December 31, 2017

 

 

17,943,436

 

 

$

30.42

 

 

 

8.1

 

 

$

55,794

 

Vested and expected to vest at December 31, 2017

 

 

17,943,436

 

 

$

30.42

 

 

 

8.1

 

 

$

55,794

 

Exercisable at December 31, 2017

 

 

6,464,292

 

 

$

26.07

 

 

 

6.6

 

 

$

41,449