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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity [Abstract]  
Summary of Stock Option Activity
The following tables represent stock option activity for the years ended December 31, 2017 and 2016:
 
  
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, 2015
  
1,223,156
  
$
8.22
   
6.66
  
$
0
 
Granted
  
663,431
  
$
2.51
         
Exercised
  
(185
)
 
$
2.51
         
Forfeited
  
(504,559
)
 
$
7.12
         
Outstanding options at December 31, 2016
  
1,381,843
  
$
14.85
   
4.95
  
$
50
 
Granted
  
430,500
  
$
2.29
         
Exercised
  
(0
)
 
$
-
         
Forfeited
  
(1,080,153
)
 
$
5.90
         
Outstanding options at December 31, 2017
  
732,190
  
$
3.72
   
8.17
  
$
56
 
Options vested and expected to vest
  
679,822
  
$
3.83
   
8.06
  
$
50
 
Exercisable at December 31, 2017
  
231,039
  
$
6.72
   
5.15
  
$
3
 
Summary of Additional Information Related to Options Outstanding
A summary of additional information related to the options outstanding as of December 31, 2017 under the 2010 and 2014 Plans are as follows:

Option Plans Range of Exercise Prices
  
Number of Outstanding Options
  
Weighted Average Remaining Contractual Life
  
Weighted Average Exercise Price
 
           
$
2.29 - $2.29
   
428,013
   
9.83
  
$
2.29
 
$
2.51-$2.51
   
115,438
   
8.13
  
$
2.51
 
$
2.52-$5.10
   
74,784
   
7.67
  
$
2.84
 
$
6.30-$11.73
   
73,805
   
2.13
  
$
7.86
 
$
12.48-$15.33
   
9,963
   
3.26
  
$
13.02
 
$
15.51-$18.39
   
30,187
   
2.46
  
$
17.73
 
     
732,190
         
Summary of Restricted Stock Units Activity
The following table represents RSU activity for the years ended December 31, 2017 and 2016:
 
  
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, 2015
  
565,965
  
$
6.75
   
1.41
  
$
1,715
 
Awarded
  
203,449
  
$
2.65
         
Released
  
(270,132
)
 
$
7.14
         
Forfeited
  
(147,361
)
 
$
5.57
         
Outstanding RSUs at December 31, 2016
  
351,921
  
$
4.59
   
1.06
  
$
908
 
Awarded
  
102,880
  
$
2.43
         
Released
  
(153,714
)
 
$
3.45
         
Forfeited
  
(164,758
)
 
$
5.78
         
Outstanding RSUs at December 31, 2017
  
136,329
  
$
2.80
   
0.80
  
$
329