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Stock-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2016
Stock-based Compensation  
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, 

 

 

    

2016

    

2015

    

2016

    

2015

 

Cost of revenue

 

$
5

 

$
5

 

$
15

 

$
15

 

Selling, general and administrative

 

 
238

 

 
260

 

 
651

 

 
902

 

Research and development

 

 
38

 

 
46

 

 
123

 

 
134

 

Total stock-based compensation

 

 
281

 

 
311

 

 
789

 

 
1,051

 

Tax effect on stock-based compensation

 

 

 —

 

 

 —

 

 

 —

 

 

 —

 

Net effect on net income (loss)

 

$
281

 

$
311

 

$
789

 

$
1,051

 

 

Weighted-average assumptions

The fair value of our stock options granted to employees for the three and nine months ended September 30, 2016 was estimated using the following weighted-average assumptions:

 

 

 

 

 

 

 

 

 

Three Months Ended

 

Nine Months Ended

 

 

 

September 30, 

 

September 30, 

 

 

    

2016*

    

2016

 

Expected term (in years)

 

 —

 
4.0

 

Volatility

 

 —

%  
49.21

%

Expected dividend

 

 —

%  

 —

%

Risk-free interest rate

 

 —

%  
1.38

%

 

Summary of stock option activity

The following table summarizes the stock option transactions during the nine months ended September 30, 2016 (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, 2016

 
3,779

 

$
2.97

 
6.26

 

$
764

 

Granted

 
68

 

 
2.56

 

 

 

 

 

 

Exercised

 
(169)

 

 
2.52

 

 

 

 

 

 

Canceled and expired

 
(536)

 

 
3.21

 

 

 

 

 

 

Balance as of September 30, 2016

 
3,142

 

$
2.94

 
6.65

 

$
7,319

 

Options vested as of September 30, 2016 and unvested options expected to vest, net of forfeitures

 
3,084

 

$
2.96

 
6.61

 

$
7,149

 

Options exercisable as of September 30, 2016

 
1,825

 

$
3.43

 
5.22

 

$
3,479

 

 

Restricted stock awards

A summary of activity related to restricted stock awards for the nine months ended September 30, 2016 is presented below (in thousands, except per share data):

 

 

 

 

 

 

 

 

 

    

 

    

Weighted-Average

 

 

 

 

 

Grant Date

 

Stock Awards

    

Shares

    

Fair Value

 

Non-vested as of January 1, 2016

 
546

 

$
2.39

 

Granted

 
49

 

$
3.69

 

Vested

 
(37)

 

$
2.46

 

Forfeited

 
(207)

 

$
2.55

 

Non-vested as of  September 30, 2016

 
351

 

$
2.47