XML 43 R32.htm IDEA: XBRL DOCUMENT v3.10.0.1
STOCK-BASED COMPENSATION (Tables)
6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Grants in Period, Weighted Average Grant Date Fair Value
The weighted average grant date fair value per share of the options awarded to employees were as follows:
 
Three Months Ended
 
Six Months Ended
 
June 30,
2018
 
June 30,
2017
 
June 30,
2018
 
June 30,
2017
Weighted average grant date fair value per share
$
17.09

 
$
9.89

 
$
14.66

 
$
8.49


Summary of Stock Option Activity
Stock option activity during the six months ended June 30, 2018 is summarized as follows:
 
Option Shares (thousands)
 
Weighted average exercise price
 
Weighted average remaining contractual life (years)
 
Aggregate intrinsic value (thousands)
Outstanding at December 31, 2017
9,041

 
$
23.40

 
 
 
 
Granted
2,454

 
46.54

 
 
 
 
Exercised
(1,590
)
 
20.98

 
 
 
 
Forfeited
(229
)
 
27.23

 
 
 
 
Outstanding at June 30, 2018
9,676

 
$
29.57

 
8.0
 
$
202,872

Exercisable at June 30, 2018
3,749

 
$
21.54

 
6.4
 
$
108,384

Expected to vest at June 30, 2018
5,927

 
$
34.66

 
9.0
 
$
94,488

Intrinsic Value and Stock-based Compensation Schedule
The intrinsic value of stock options exercised and the compensation cost related to stock options granted to employees and non-employees under our stock plans was as follows:
 
Three Months Ended
 
Six Months Ended
(In thousands)
June 30,
2018
 
June 30,
2017
 
June 30,
2018
 
June 30,
2017
Intrinsic value of stock options exercised
$
33,305

 
$
2,870

 
$
48,153

 
$
4,760

 
 
 
 
 
 
 
 
Stock-based compensation expense
$
5,480

 
$
3,571

 
$
11,533

 
$
7,062

Net stock-based compensation capitalized into inventory
71

 
47

 
128

 
98

Total stock-based compensation cost
$
5,551

 
$
3,618

 
$
11,661

 
$
7,160