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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 30, 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:

 

 

Three Months Ended September 30,

 

 

Nine Months Ended September 30,

 

 

2017

 

 

2016

 

 

2017

 

 

2016

 

Dividend yield

 

0

%

 

 

0

%

 

 

0

%

 

 

0

%

Expected life

3.3 years

 

 

3.3 years

 

 

3.3 years

 

 

3.4 years

 

Expected volatility

 

52

%

 

 

55

%

 

 

52

%

 

 

55

%

Risk-free interest rate

 

1.7

%

 

 

1.0

%

 

 

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):  

 

Three Months Ended September 30,

 

 

Nine Months Ended September 30,

 

 

2017

 

 

2016

 

 

2017

 

 

2016

 

Cost of revenue — professional engineering service

$

13

 

 

$

(4

)

 

$

98

 

 

$

169

 

Selling, general and administrative

 

457

 

 

 

262

 

 

 

1,061

 

 

 

618

 

Research and development

 

70

 

 

 

22

 

 

 

191

 

 

 

121

 

Total stock-based compensation expense

$

540

 

 

$

280

 

 

$

1,350

 

 

$

908

 

Per diluted share

$

0.04

 

 

$

0.02

 

 

$

0.11

 

 

$

0.07

 

 
Summary of Stock Option Activity

The following table summarizes stock option activity under the Plans:  

Stock Options

 

Number of

Shares

 

 

Weighted

Average

Exercise

Price

 

 

Weighted

Average

Remaining

Contractual

Life

(in years)

 

 

Aggregate

Intrinsic

Value

 

Balance at January 1, 2017

 

 

1,846,768

 

 

$

4.84

 

 

 

8.19

 

 

$

2,138,361

 

Granted

 

 

188,625

 

 

$

5.22

 

 

 

 

 

 

 

 

 

Exercised

 

 

(45,241

)

 

$

3.71

 

 

 

 

 

 

 

 

 

Forfeited

 

 

(54,043

)

 

$

5.30

 

 

 

 

 

 

 

 

 

Expired

 

 

(29,325

)

 

$

5.67

 

 

 

 

 

 

 

 

 

Balance at September 30, 2017

 

 

1,906,784

 

 

$

4.88

 

 

 

7.79

 

 

$

1,248,990

 

Vested and expected to vest at September 30, 2017

 

 

1,773,550

 

 

$

4.85

 

 

 

7.69

 

 

$

1,231,129

 

Exercisable at September 30, 2017

 

 

874,714

 

 

$

4.31

 

 

 

6.48

 

 

$

1,098,971

 

 
Summary of Certain Information about Stock Options

The following table summarizes certain information about stock options:

 

 

Three Months Ended September 30,

 

 

Nine Months Ended September 30,

 

 

2017

 

 

2016

 

 

2017

 

 

2016

 

Weighted-average grant-date fair value of option

   grants for the period

$

2.45

 

 

$

2.53

 

 

$

2.62

 

 

$

2.83

 

Options in-the-money at period end

 

1,261,705

 

 

 

766,101

 

 

 

1,261,705

 

 

 

766,101

 

Aggregate intrinsic value of options exercised

$

31,338

 

 

$

226,430

 

 

$

89,171

 

 

$

568,516

 

 
Summary of Restricted Stock Unit Activity

The following table summarizes RSU activity under the Plans:

  

Number of

Shares

 

 

Weighted

Average

Grant Date Fair

Value

 

Unvested at January 1, 2017

 

119,606

 

 

$

5.60

 

Granted

 

74,819

 

 

$

4.96

 

Vested

 

(51,132

)

 

$

5.57

 

Forfeited

 

—

 

 

$

-

 

Unvested at September 30, 2017

 

143,293

 

 

$

5.28

 

Expected to vest after September 30, 2017

 

128,893

 

 

$

5.28

 

 
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 September 30, 2017:

 

Stock options outstanding

 

1,906,784

 

RSUs outstanding

 

143,293

 

Stock awards available for future grant

 

1,209,084

 

Common stock reserved for future issuance

 

3,259,161