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Stock Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Options Granted, Exercised, Expired and Forfeited
A summary of stock options expired and forfeited under our plans and options outstanding as of, and changes made during, the years ended December 31, 2018 and 2017 is presented below (options in thousands):
 
Outstanding
 
Exercisable
 
Number of Options
 
Weighted Average Exercise Price
 
Number of Options
 
Weighted Average Exercise Price
Options outstanding, December 31, 2016
1,222

 
$
1.99

 
1,222

 
$
1.99

Expired
(11
)
 
2.42

 
 
 
 
Forfeited
(9
)
 
1.87

 
 
 
 
Options outstanding, December 31, 2017
1,202

 
1.99

 
1,202

 
1.99

Expired
(10
)
 
2.21

 
 
 
 
Forfeited
(12
)
 
1.68

 
 
 
 
Options outstanding and exercisable, December 31, 2018
1,180

 
$
1.99

 
1,180

 
$
1.99
Shares Outstanding and Exercisable, By Exercise Price Range
Additional information as of December 31, 2018 is as follows (options in thousands):
 
 
Outstanding and Exercisable
Range of price
 
Number
of Options
 
Weighted
Average
Remaining
Contractual
Life (In Years)
 
Weighted
Average
Exercise
Price
$0.90 – $1.44
 
51

 
4.35
 
$
0.91

$1.45 – $1.96
 
103

 
4.12
 
1.52

$1.97 – $2.04
 
876

 
4.04
 
1.98

$2.05 – $2.60
 
50

 
3.42
 
2.18

$2.61 – $3.02
 
100

 
3.20
 
3.02

 
 
1,180

 
3.96
 
$
1.99
Restricted Stock  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Nonvested Share Activity
A summary of restricted stock granted, vested and unvested outstanding as of, and changes made during, the years ended December 31, 2018 and 2017, is presented below (shares in thousands):
 
Restricted Shares
 
Weighted Average
Grant Price
Unvested restricted stock outstanding, December 31, 2016
363

 
$
1.58

Vested
(9
)
 
1.47

Forfeited
(13
)
 
1.47

Unvested restricted stock outstanding, December 31, 2017
341

 
1.06

Vested
(228
)
 
0.84

Unvested restricted stock outstanding, December 31, 2018
113

 
$
1.49
Schedule of Compensation Expense
Stock-based compensation expense relating to restricted stock awards is allocated as follows (in thousands):
 
Year Ended December 31,
 
2018
 
2017
Cost of revenue
$
—

 
$
6

Research and development
15

 
5

General and administrative
—

 
47

 
$
15

 
$
58
RSUs  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Nonvested Share Activity
A summary of restricted stock units (“RSUs”) granted, vested, forfeited and unvested outstanding as of, and changes made during, the years ended December 31, 2018 and 2017, is presented below (shares in thousands):
 
Restricted Stock Units
 
Weighted Average
Grant Price
Unvested restricted stock units outstanding, December 31, 2016
3,196

 
$
0.62

Vested
(725
)
 
0.42

Forfeited
(719
)
 
0.94

Unvested restricted stock units outstanding, December 31, 2017
1,752

 
0.57

Granted
4,878

 
0.17

Vested
(554
)
 
0.75

Forfeited
(1,041
)
 
0.43

Unvested restricted stock units outstanding, December 31, 2018
5,035

 
$
0.19
Schedule of Compensation Expense
Stock-based compensation expense relating to restricted stock units is allocated as follows (in thousands):
 
Year Ended December 31,
 
2018
 
2017
Cost of revenue
$
43

 
$
38

Research and development
50

 
54

Sales and marketing
7

 
9

General and administrative
250

 
281

 
$
350

 
$
382