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Restricted Stock Awards (Tables) - Restricted stock
 6 Months Ended
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Restricted Stock Activity
A summary of unvested restricted stock awards outstanding as of, and changes made during, the six months ended June 30, 2018, is presented below (shares in thousands):
 
Restricted Shares
 
Weighted Average
Grant Price
Unvested restricted stock outstanding, December 31, 2017
341

 
$
1.06

Vested
(228
)
 
0.84

Unvested restricted stock outstanding, June 30, 2018
113

 
$
1.49
Summary of Compensation Expense
Stock-based compensation expense related to restricted stock awards is allocated as follows (in thousands):
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2018
 
2017
 
2018
 
2017
Cost of revenue
$
—

 
$
2

 
$
—

 
$
4

Research and development
—

 
1

 
—

 
2

General and administrative
2

 
12

 
12

 
24

 
$
2

 
$
15

 
$
12

 
$
30