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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2021
Stock-Based Compensation  
Summary of compensation costs related to stock-based awards

The following table summarizes compensation costs related to our stock-based awards (in thousands, except per share data):

Three Months Ended

Nine Months Ended

September 30, 

September 30, 

    

2021

    

2020

    

2021

    

2020

 

Cost of revenue

$

188

$

28

$

263

$

83

Selling, general and administrative

 

1,252

 

496

 

2,694

 

1,480

Research and development

 

199

 

124

 

473

 

369

Total stock-based compensation

 

1,639

 

648

 

3,430

 

1,932

Tax effect on stock-based compensation

 

 

 

 

Net effect on net income

$

1,639

$

648

$

3,430

$

1,932

Summary of stock option activity

The following table summarizes the stock option transactions during the nine months ended September 30, 2021 (in thousands, except per share data):

Weighted-

    

    

    

average

    

 

Weighted-

Remaining

 

Number of

average

Contractual

Aggregate

 

Options

Exercise

Life

Intrinsic

 

Stock Options

    

Outstanding

    

Price

    

(in years)

    

Value

 

Balance as of January 1, 2021

 

1,885

$

4.42

 

6.17

$

9,713

Granted

 

 

Exercised

 

(482)

3.30

Canceled and expired

 

Balance as of September 30, 2021

 

1,403

$

4.80

 

5.78

$

5,094

Options vested as of September 30, 2021 and unvested options expected to vest, net of forfeitures

 

1,397

$

4.81

 

5.77

$

5,064

Options exercisable as of September 30, 2021

 

1,081

$

5.13

 

5.16

$

3,605

Summary of restricted stock awards activity

A summary of activity related to restricted stock awards for the nine months ended September 30, 2021 is presented below (in thousands, except per share data):

    

    

Weighted-Average

 

Grant Date

 

Stock Awards

    

Shares

    

Share Value

 

Non-vested as of January 1, 2021

1,022

$

5.27

Granted

 

67

$

11.58

Vested

 

(139)

$

5.85

Forfeited

(12)

$

5.29

Non-vested as of September 30, 2021

 

938

$

5.64

Summary of unvested at-risk performance shares

A summary of the status of our unvested at-risk, performance shares as of September 30, 2021 is presented below (in thousands, except per share data):

    

    

Weighted-Average

Grant Date

Stock Awards

    

Shares*

    

Share Value

Non-vested as of January 1, 2021

$

Granted

 

152

$

15.37

Vested

 

$

Forfeited

$

Non-vested as of September 30, 2021

 

152

$

15.37