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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2019
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

 

 

 

March 31, 

 

 

    

2019

    

2018

 

Cost of revenue

 

$

31

 

$

21

 

Selling, general and administrative

 

 

437

 

 

369

 

Research and development

 

 

90

 

 

77

 

Total stock-based compensation

 

 

558

 

 

467

 

Tax effect on stock-based compensation

 

 

 —

 

 

 —

 

Net effect on net income

 

$

558

 

$

467

 

 

Summary of stock option activity

The following table summarizes the stock option transactions during the three months ended March 31, 2019 (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, 2019

 

2,654

 

$

4.09

 

6.28

 

$

2,720

 

Granted

 

 —

 

 

 —

 

 

 

 

 

 

Exercised

 

 —

 

 

 —

 

 

 

 

 

 

Canceled and expired

 

 —

 

 

 —

 

 

 

 

 

 

Balance as of March 31, 2019

 

2,654

 

$

4.09

 

6.04

 

$

2,857

 

Options vested as of March 31, 2019 and unvested options expected to vest, net of forfeitures

 

2,632

 

$

4.07

 

6.01

 

$

2,856

 

Options exercisable as of March 31, 2019

 

1,956

 

$

3.62

 

5.26

 

$

2,546

 

 

Summary of restricted stock awards activity

A summary of activity related to restricted stock awards for the three months ended March 31, 2019 is presented below (in thousands, except per share data):

 

 

 

 

 

 

 

 

 

    

 

    

Weighted-Average

 

 

 

 

 

Grant Date

 

Stock Awards

    

Shares

    

Fair Value

 

Non-vested as of January 1, 2019

 

633

 

$

6.85

 

Granted

 

12

 

$

4.32

 

Vested

 

(1)

 

$

7.35

 

Forfeited

 

 —

 

$

 —

 

Non-vested as of March 31, 2019

 

644

 

$

6.80