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Restricted Stock Awards (Tables) - Restricted Stock
 6 Months Ended
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Restricted Stock Activity
A summary of restricted stock awards granted, vested, forfeited and unvested outstanding as of, and changes made during, the six months ended June 30, 2016, is presented below (shares in thousands):
 
Restricted Shares
 
Weighted Average
Grant Price
Unvested restricted shares outstanding, December 31, 2015
261

 
$
1.58

Granted
170

 
0.55

Vested
(68
)
 
1.67

Forfeited
—

 
—

Unvested restricted shares outstanding, June 30, 2016
363

 
$
1.08
Summary of Compensation Expense
Stock-based compensation expense related to restricted stock awards is allocated as follows for the three and six months ended June 30, 2016 and 2015 (in thousands):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2016
 
2015
 
2016
 
2015
Cost of revenue
$
2

 
$
2

 
$
4

 
$
(20
)
Research and development
1

 
1

 
2

 
(4
)
Sales and marketing
—

 
2

 
—

 
(29
)
General and administrative
24

 
33

 
141

 
32

 
$
27

 
$
38

 
$
147

 
$
(21
)