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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2019
Stock-Based Compensation.  
Schedule summarizing stock option activity under the 2001 Stock Plan, 2011 Stock Plan and 2015 Stock Plan

Stock Options

The following table summarizes stock option activity under the 2001 Stock Plan, 2011 Stock Plan and 2015 Stock Plan:

    

Number of

    

    

Weighted-

    

 

shares

Weighted-

average

Aggregate

underlying

average

remaining

intrinsic

options

exercise price

contractual

value (in

(in thousands)

per share

    

life (in years)

thousands)

Outstanding at December 31, 2016

 

5,911

$

12.59

7.3

129,591

 

Granted

 

1,877

43.85

Exercised

 

(639)

5.76

22,105

Canceled/forfeited/expired

 

(123)

23.79

Outstanding at December 31, 2017

 

7,026

$

21.36

7.3

$

69,555

Granted

 

896

30.83

Exercised

 

(1,304)

14.27

46,639

Canceled/forfeited/expired

 

(311)

31.14

Outstanding at December 31, 2018

 

6,307

$

23.69

6.7

$

204,896

Granted

186

68.10

Replacement Awards

803

13.64

Exercised

(696)

21.53

33,132

Canceled/forfeited/expired

(17)

42.75

Outstanding at December 31, 2019

6,583

$

23.91

6.1

$

204,062

Vested and expected to vest at December 31, 2019

6,418

$

24.16

6.2

$

197,261

Exercisable at December 31, 2019

4,985

$

19.71

5.5

$

173,590

Schedule of the weighted-average assumptions used to estimate the fair value of options granted to employees

Year ended

 

December 31,

 

2019

2018

2017

 

Risk-free interest rate

    

2.17

%  

2.67

%  

2.13

Expected dividend yield

 

0.0

%  

0.0

%  

0.0

%

Expected volatility

 

46.8

%  

44.9

%  

46.5

%

Expected term (in years)

 

6.01

6.10

6.04

Schedule summarizing restricted stock unit activity

Weighted-

Number of

average

shares

grant date

(in thousands)

fair value

Unvested at December 31, 2017

173

$

39.10

Granted

419

33.64

Vested

(41)

39.36

Canceled/forfeited

(19)

33.67

Unvested at December 31, 2018

 

532

$

35.17

Granted

323

69.76

Replacement Awards

102

63.07

Vested

(237)

36.54

Canceled/forfeited

(25)

44.59

Unvested at December 31, 2019

695

$

54.40

Schedule summarizing cash settled stock options activity

    

Number of

    

    

Weighted-

    

 

shares

Weighted-

average

Aggregate

underlying

average

remaining

intrinsic

options

exercise price

contractual

value (in

(in thousands)

per share

    

life (in years)

thousands)

Outstanding at December 31, 2018

 

$

$

Replacement Awards

230

25.89

Exercised

Canceled/forfeited/expired

Outstanding at December 31, 2019

230

$

25.89

0.5

$

6,572

Exercisable at December 31, 2019

230

$

25.89

0.5

$

6,572

Schedule summarizing the allocation of stock-based compensation

The following table summarizes the allocation of stock-based compensation related to stock options and RSUs and includes Replacement Awards, as well as cash-settled stock options in the accompanying consolidated statements of operations (in thousands):

Year ended

 

December 31,

 

2019

2018

2017

 

    

Cost of sales

    

$

1,127

$

703

    

$

597

Selling, general & administrative

31,801

 

19,816

 

13,006

Research and development

6,553

 

5,185

 

3,989

Total

 

$

39,481

$

25,704

$

17,592

Schedule of Common stock reserved for issuance

Common stock reserved for issuance is as follows (in thousands):

    

As of

 

December 31,

 

2019

 

Stock options issued and outstanding—2001 Plan

413

Stock options issued and outstanding—2011 Plan

1,384

Stock options issued and outstanding—2015 Plan

4,786

Employee stock purchase plan

1,341

Authorized for future stock awards or option grants

5,405

13,329