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Stockholder's Equity (Tables)
 9 Months Ended
Sep. 30, 2017
Stockholder's Equity [Abstract]  
Summary of Stock Option Activity
The following table represents the stock option activity for the nine months ended September 30, 2017:

  
Number of
Shares
  
Weighted
Average
Exercise Price
per Share
  
Weighted
Average
Remaining
Contractual
Term (in years)
  
Aggregate
Intrinsic Value
(in thousands)
 
Outstanding options at December 31, 2016
  
1,381,843
  
$
5.88
   
4.95
  
$
50
 
Granted
  
2,000
  
$
2.57
         
Exercised
  
—
   
—
         
Forfeited
  
(966,751
)
 
$
6.03
         
Outstanding options at September 30, 2017
  
417,092
  
$
5.50
   
6.03
  
$
0
 
Options vested and expected to vest
  
405,254
  
$
5.58
   
5.95
  
$
0
 
Exercisable at September 30, 2017
  
267,171
  
$
7.08
   
4.57
  
$
0
 
Summary of Restricted Stock Units Activity

The following table represents RSU activity for the nine months ended September 30, 2017:

  
Number of
Shares
  
Weighted
Average
Grant-Date
Fair Value
per Share
  
Weighted
Average
Remaining
Contractual Term (in years)
  
Aggregate
Intrinsic Value
(in thousands)
 
Outstanding RSUs at December 31, 2016
  
351,921
  
$
4.59
   
1.06
  
$
908
 
Awarded
  
102,880
  
$
2.43
         
Released
  
(151,886
)
 
$
3.41
         
Forfeited
  
(146,165
)
 
$
6.01
         
Outstanding RSUs at September 30, 2017
  
156,750
  
$
3.00
   
0.95
  
$
368