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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
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,

 

 

 

2017

 

 

2016

 

Dividend yield

 

 

0

%

 

 

0

%

Expected life

 

6.5 years

 

 

6.5 years

 

Expected volatility

 

 

52

%

 

 

55

%

Risk-free interest rate

 

 

1.7

%

 

 

1.1

%

  
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,

 

 

 

2017

 

 

2016

 

Cost of revenue— professional engineering service

 

$

107

 

 

$

220

 

Selling, general and administrative

 

 

1,414

 

 

 

868

 

Research and development

 

 

236

 

 

 

159

 

Total stock-based compensation expense

 

$

1,757

 

 

$

1,247

 

Per basic share

 

$

0.14

 

 

$

0.10

 

Per diluted share

 

$

0.14

 

 

$

0.10

 

  
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, 2015

 

 

1,778,697

 

 

$

4.43

 

 

 

7.83

 

 

 

 

 

Granted

 

 

903,248

 

 

$

5.24

 

 

 

 

 

 

 

 

 

Exercised

 

 

(371,845

)

 

$

3.17

 

 

 

 

 

 

 

 

 

Forfeited

 

 

(396,161

)

 

$

5.32

 

 

 

 

 

 

 

 

 

Expired

 

 

(67,171

)

 

$

5.91

 

 

 

 

 

 

 

 

 

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

 

 

$

781,735

 

Vested and expected to vest at December 31, 2017

 

 

1,792,667

 

 

$

4.85

 

 

 

7.52

 

 

$

781,025

 

Exercisable at December 31, 2017

 

 

1,065,767

 

 

$

4.48

 

 

 

6.63

 

 

$

775,767

 

 
Summary of Certain Additional Information about Stock Options

The following table summarizes certain additional information about stock options:

  

 

 

Year Ended December 31,

 

 

 

2017

 

 

2016

 

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

 

$

2.62

 

 

$

2.63

 

Vested options in-the-money

 

 

603,925

 

 

 

605,017

 

Aggregate intrinsic value of options exercised during the year

 

$

104,512

 

 

$

773,327

 

 
Summary of Restricted Stock Unit Activity

The following table summarizes RSU activity:

 

 

Number of

 

 

Weighted Average

 

 

 

Shares

 

 

Award Price

 

Unvested at December 31, 2015

 

 

104,463

 

 

$

5.97

 

Granted

 

 

107,370

 

 

$

5.41

 

Vested

 

 

(76,258

)

 

$

5.81

 

Forfeited

 

 

(15,969

)

 

$

5.77

 

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

 

Expected to vest after December 31, 2017

 

 

102,796

 

 

$

5.33

 

  
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, 2017:

  

Stock options outstanding

 

 

1,912,161

 

Restricted stock units outstanding

 

 

116,968

 

Stock options available for future grant

 

 

1,189,256

 

Common stock reserved for future issuance

 

 

3,218,385