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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Stock Option Transactions

Stock option transactions during the year ended December 31, 2016 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, 2015

 

 

9,543,076

 

 

$

22.64

 

 

 

 

 

 

 

 

 

Granted

 

 

5,721,335

 

 

$

26.98

 

 

 

 

 

 

 

 

 

Exercised

 

 

(1,977,661

)

 

$

9.10

 

 

 

 

 

 

 

 

 

Cancelled/forfeited

 

 

(542,873

)

 

$

29.07

 

 

 

 

 

 

 

 

 

Outstanding at December 31, 2016

 

 

12,743,877

 

 

$

26.41

 

 

 

8.0

 

 

$

65,526

 

Vested and expected to vest at December 31, 2016

 

 

11,859,427

 

 

$

26.22

 

 

 

7.9

 

 

$

63,136

 

Exercisable at December 31, 2016

 

 

4,477,719

 

 

$

21.91

 

 

 

6.4

 

 

$

42,438