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Stockholders' Equity
 3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Stockholders' Equity
9. Stockholders' Equity
Restricted Stock Awards
Restricted share activity during the three months ended March 31, 2017 was as follows:
 
 
Number of
Restricted Shares
Outstanding
 
Weighted-Average Grant Date Fair Value
Unvested balances at December 31, 2016
 
839,477

 
$
7.55

Awards granted
 
622,520

 
 
Awards vested
 
(34,749
)
 
 
Awards forfeited
 
(17,001
)
 
 
Unvested balances at March 31, 2017
 
1,410,247

 
$
10.86


Stock Option Activity
Stock option activity during the three months ended March 31, 2017 was as follows:
 
 
Number of
Options
Outstanding
 
Weighted–
Average
Exercise
Price
Outstanding at December 31, 2016
 
759,719

 
$
6.06

Options granted
 
—

 
$
—

Options exercised
 
(24,748
)
 
$
6.46

Options forfeited
 
(2,906
)
 
$
6.21

Options expired
 
(94
)
 
$
6.26

Outstanding at March 31, 2017
 
731,971

 
$
6.05


Share-based Compensation
The Company recognized share-based compensation expense from all awards in the following expense categories (in thousands):
 
Three Months Ended March 31,
 
2017
 
2016
Cost of revenue
$
18

 
$
7

Research and development
60

 
14

Sales and marketing
23

 
13

General and administrative
2,203

 
660

Total
$
2,304

 
$
694