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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Fair Values of Stock Option Grants Estimated with Weighted Average Assumptions The fair values of our stock option grants were estimated with the following weighted average assumptions:

  

 

 

Year Ended December 31,

 

 

 

2018

 

 

2017

 

Dividend yield

 

 

0

%

 

 

0

%

Expected life

 

6.1 years

 

 

6.5 years

 

Expected volatility

 

 

56

%

 

 

52

%

Risk-free interest rate

 

 

2.6

%

 

 

1.7

%

  
Stock-Based Compensation Expense

The impact on our results of operations from stock-based compensation expense was as follows (in thousands, except per share amounts):

 

 

 

Year Ended December 31,

 

 

 

2018

 

 

2017

 

Cost of revenue— professional engineering service

 

$

28

 

 

$

107

 

Selling, general and administrative

 

 

460

 

 

 

1,414

 

Research and development

 

 

190

 

 

 

236

 

Total stock-based compensation expense

 

$

678

 

 

$

1,757

 

Per basic share

 

$

0.05

 

 

$

0.14

 

Per diluted share

 

$

0.05

 

 

$

0.14

 

  
Summary of Stock Option Activity

The following table summarizes stock option activity:  

 

 

 

 

 

 

 

 

 

 

 

Weighted Average

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Remaining

 

 

 

 

 

 

 

 

 

 

 

Weighted Average

 

 

Contractual Life

 

 

Aggregate

 

 

 

Number of Shares

 

 

Exercise Price

 

 

(in years)

 

 

Intrinsic Value

 

Balance at December 31, 2016

 

 

1,846,768

 

 

$

4.84

 

 

 

8.19

 

 

 

 

 

Granted

 

 

248,100

 

 

$

5.18

 

 

 

 

 

 

 

 

 

Exercised

 

 

(54,692

)

 

$

3.66

 

 

 

 

 

 

 

 

 

Forfeited

 

 

(91,411

)

 

$

5.31

 

 

 

 

 

 

 

 

 

Expired

 

 

(36,604

)

 

$

5.83

 

 

 

 

 

 

 

 

 

Balance at December 31, 2017

 

 

1,912,161

 

 

$

4.88

 

 

 

7.61

 

 

 

 

 

Granted

 

 

316,393

 

 

$

3.63

 

 

 

 

 

 

 

 

 

Exercised

 

 

(2,422

)

 

$

3.59

 

 

 

 

 

 

 

 

 

Forfeited

 

 

(434,374

)

 

$

4.88

 

 

 

 

 

 

 

 

 

Expired

 

 

(401,746

)

 

$

4.27

 

 

 

 

 

 

 

 

 

Balance at December 31, 2018

 

 

1,390,012

 

 

$

4.77

 

 

 

6.83

 

 

$

—

 

Vested and expected to vest at December 31, 2018

 

 

1,293,384

 

 

$

4.79

 

 

 

6.70

 

 

$

—

 

Exercisable at December 31, 2018

 

 

929,224

 

 

$

4.86

 

 

 

6.05

 

 

$

—

 

 
Summary of Certain Additional Information about Stock Options

The following table summarizes certain additional information about stock options:

  

 

 

Year Ended December 31,

 

 

 

2018

 

 

2017

 

Weighted average grant-date fair value for options granted during the year

 

$

1.81

 

 

$

2.62

 

Vested options in-the-money

 

 

—

 

 

 

603,925

 

Aggregate intrinsic value of options exercised during the year

 

$

1,853

 

 

$

104,512

 
Summary of Restricted Stock Unit Activity

The following table summarizes RSU activity:

 

 

 

Number of

 

 

Weighted Average

 

 

 

Shares

 

 

Award Price

 

Unvested at December 31, 2016

 

 

119,606

 

 

$

5.60

 

Granted

 

 

79,819

 

 

$

4.98

 

Vested

 

 

(82,457

)

 

$

5.39

 

Forfeited

 

 

-

 

 

$

-

 

Unvested at December 31, 2017

 

 

116,968

 

 

$

5.33

 

Granted

 

 

251,371

 

 

$

2.72

 

Vested

 

 

(113,535

)

 

$

4.19

 

Forfeited

 

 

(68,288

)

 

$

4.30

 

Unvested at December 31, 2018

 

 

186,516

 

 

$

2.87

 

Expected to vest after December 31, 2018

 

 

165,952

 

 

$

2.84

 

  
Summary of Shares of Common Stock Reserved for Future Issuance under Plans

The following table summarizes our shares of common stock reserved for future issuance under the Plans as of December 31, 2018:

  

Stock options outstanding

 

 

1,390,012

 

Restricted stock units outstanding

 

 

186,515

 

Stock options available for future grant

 

 

1,525,900

 

Common stock reserved for future issuance

 

 

3,102,427