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Restricted Stock Awards (Tables) - Restricted Stock
 6 Months Ended
Jun. 30, 2017
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, 2017, is presented below (shares in thousands):
 
Restricted Shares
 
Weighted Average
Grant Price
Unvested restricted shares outstanding, December 31, 2016
363

 
$
1.08

Granted
—

 
—

Vested
(9
)
 
1.47

Forfeited
—

 
—

Unvested restricted shares outstanding, June 30, 2017
354

 
$
1.07
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, 2017 and 2016 (in thousands):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2017
 
2016
 
2017
 
2016
Cost of revenue
$
2

 
$
2

 
$
4

 
$
4

Research and development
1

 
1

 
2

 
2

General and administrative
12

 
24

 
24

 
141

 
$
15

 
$
27

 
$
30

 
$
147