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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Stock-Based Compensation Expense Related to Stock Options, PSUs, RSUs and Restricted Stock

The following table summarizes stock-based compensation expense related to stock options, performance stock units (“PSUs”), restricted stock units (“RSUs”) and restricted stock:

 

 

 

For the Three Months Ended

 

 

 

March 31,

 

(In thousands)

 

2021

 

 

2020

 

Stock-based compensation expense included in cost of revenue

 

$

131

 

 

$

115

 

Selling, general and administrative expense

 

 

1,098

 

 

 

1,075

 

Research and development expense

 

 

578

 

 

 

601

 

Stock-based compensation expense included in operating expenses

 

 

1,676

 

 

 

1,676

 

Total stock-based compensation expense

 

 

1,807

 

 

 

1,791

 

Tax benefit for expense associated with stock options, PSUs, RSUs and restricted stock

 

 

(431

)

 

 

(427

)

Total stock-based compensation expense, net of tax

 

$

1,376

 

 

$

1,364

 

 
Summary of PSUs, RSUs and Restricted Stock Outstanding

The following table summarizes PSUs, RSUs and restricted stock outstanding as of December 31, 2020 and March 31, 2021 and the changes that occurred during the three months ended March 31, 2021:

 

 

 

Number of

Shares

(in thousands)

 

 

Weighted Avg. Grant Date Fair Value

(per share)

 

Unvested PSUs, RSUs and restricted stock outstanding, December 31, 2020

 

 

1,846

 

 

$

11.49

 

PSUs, RSUs and restricted stock granted

 

 

354

 

 

$

16.72

 

PSUs, RSUs and restricted stock vested

 

 

(11

)

 

$

11.88

 

PSUs, RSUs and restricted stock forfeited

 

 

(34

)

 

$

11.48

 

Unvested PSUs, RSUs and restricted stock outstanding, March 31, 2021

 

 

2,155

 

 

$

12.40

 

 
Summary of Stock Options Outstanding

The following table summarizes stock options outstanding as of December 31, 2020 and March 31, 2021 and the changes that occurred during the three months ended March 31, 2021:

 

 

 

Number of

Stock Options

(in thousands)

 

 

Weighted Avg.

Exercise Price

(per share)

 

 

Weighted Avg.

Remaining

Contractual

Life

(in years)

 

 

Aggregate

Intrinsic Value

(in thousands)

 

Stock options outstanding, December 31, 2020

 

 

2,718

 

 

$

21.17

 

 

 

2.9

 

 

$

—

 

Stock options exercised

 

 

(80

)

 

$

15.64

 

 

 

 

 

 

$

167

 

Stock options forfeited / expired

 

 

(92

)

 

$

21.55

 

 

 

 

 

 

$

—

 

Stock options outstanding, March 31, 2021

 

 

2,546

 

 

$

21.32

 

 

 

2.6

 

 

$

779

 

Stock options exercisable, March 31, 2021

 

 

2,546

 

 

$

21.32

 

 

 

2.6

 

 

$

779