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Stockholders' Equity Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2019
Stockholders' Equity Note [Abstract]  
Summary of Impact of Results of Stock-Based Compensation
The impact on our results for stock-based compensation was as follows (in thousands): 
 
For the year ended December 31,
 
2019
 
2018
 
2017
Cost of sales
$
9

 
$
37

 
$
34

Product development
26

 
118

 
59

Selling, general, and administrative
581

 
753

 
714

Total stock-based compensation
$
616

 
$
908

 
$
807
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions
Estimates utilized in the calculation include the expected life of the option, risk-free interest rate, and expected volatility, and are further comparatively detailed as follows:  
 
2019
 
2018
 
2017
Fair value of options issued
$
0.29

 
$
1.41

 
$
2.66

Exercise price
$
0.44

 
$
1.97

 
$
3.55

Expected life of option (in years)
4.8

 
5.9

 
5.8

Risk-free interest rate
1.8
%
 
2.7
%
 
2.1
%
Expected volatility
90.0
%
 
84.2
%
 
91.9
%
Dividend yield
0.00
%
 
0.00
%
 
0.00
%
Summary of Option Activity
A summary of option activity under all plans was as follows:
 
Number of
Options
 
Weighted
Average
Exercise Price
Per Share
Outstanding at December 31, 2016
530,734

 
$
7.48

Granted
192,984

 
3.55

Cancelled
(377,095
)
 
6.71

Expired
(56,111
)
 
10.65

Exercised
(42,000
)
 
2.30

Outstanding at December 31, 2017
248,512

 
5.76

Granted
100,746

 
1.97

Cancelled
(46,387
)
 
6.96

Expired
(10,000
)
 
20.00

Outstanding at December 31, 2018
292,871

 
3.78

Granted
689,300

 
0.44

Cancelled
(177,493
)
 
2.55

Expired
(27,525
)
 
5.33

Outstanding at December 31, 2019
777,153

 
$
1.04

 
 
 
 
Vested and expected to vest at December 31, 2019
578,486

 
$
1.25

 
 
 
 
Exercisable at December 31, 2019
111,595

 
$
4.61
Schedule of Options Outstanding
The options outstanding at December 31, 2019 have been segregated into ranges for additional disclosure as follows: 

OPTIONS OUTSTANDING
 
OPTIONS EXERCISABLE
Range of Exercise Prices
 
Number of Shares Outstanding
 
Weighted Average Remaining Contractual Life (in years)
 
Weighted Average Exercise Price
 
Number of Shares Exercisable
 
Weighted Average Remaining Contractual Life (in years)
 
Weighted Average Exercise Price
$0.42
—
$0.45
 
450,000

 
9.5
 
$
0.42

 
—

 
—

 
$
—

$0.46
—
$1.81
 
213,800

 
1.9
 
0.48

 
—

 
—

 
—

$1.82
—
$3.76
 
72,603

 
7.2
 
3.34

 
70,845

 
7.2

 
3.35

$3.77
—
$10.70
 
40,750

 
4.1
 
6.80

 
40,750

 
4.1

 
6.80

 
 
 
 
777,153

 
6.9
 
$
1.04

 
111,595

 
6.0

 
$
4.61
Summary of Restricted Stock Activity
The following table shows a summary of restricted stock and restricted stock unit activity: 
 
Restricted Stock Units Outstanding
 
Weighted
Average
Grant Date
Fair Value
At December 31, 2016
250,115

 
$
6.34

Granted
375,542

 
3.18

Vested
(115,622
)
 
5.78

Forfeited
(203,893
)
 
5.30

At December 31, 2017
306,142

 
3.37

Granted
553,657

 
2.38

Vested
(222,835
)
 
3.11

Forfeited
(90,106
)
 
2.99

At December 31, 2018
546,858

 
2.54

Granted
85,575

 
0.62

Vested
(436,282
)
 
2.23

Forfeited
(163,100
)
 
2.33

At December 31, 2019
33,051

 
$
2.63