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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Stock option activity
Options granted under the Plans vest as determined by the Company’s Compensation and Stock Option Committee and expire over varying terms, but not more than ten years from the date of grant. Stock option activity for 2013, 2012, and 2011 is as follows:

   
 
Number of
Options
  
Exercise Price
per Share
  
Weighted Average
Exercise Price
  
Weighted
Average
Remaining
Life (Years)
 
 
 
  
  
  
 
Outstanding at December 31, 2010
  
3,760,650
  
$
1.23-15.54
  
$
4.88
   
6.65
 
  Granted
  
671,326
   
2.00-9.18
   
5.72
     
  Expired
  
(120,000
)
  
3.28
   
3.28
     
  Forfeited
  
(136,900
)
  
1.40-9.93
   
4.65
     
  Exercised
  
(45,327
)
  
2.44-3.28
   
3.18
     
Outstanding at December 31, 2011
  
4,129,749
  
$
1.23-15.54
  
$
5.09
   
6.38
 
  Granted
  
1,207,452
   
1.43-4.60
   
3.80
     
  Expired
  
(420,000
)
  
1.88-5.85
   
4.81
     
  Forfeited
  
(128,314
)
  
2.26-9.18
   
5.05
     
Outstanding at December 31, 2012
  
4,788,887
  
$
1.23-15.54
  
$
4.79
   
6.88
 
  Granted
  
2,085,717
   
0.30-2.13
   
1.09
     
  Expired
  
(270,000
)
  
1.23-1.87
   
1.53
     
  Forfeited
  
(2,569,461
)
  
0.38-12.34
   
3.97
     
Outstanding at December 31, 2013
  
4,035,143
  
$
0.30-15.54
  
$
3.62
   
2.13
 
 
Exercisable at December 31, 2013
  
2,136,785
  
$
1.24-15.54
  
$
5.68
   
5.56
 
Non-vested options
A summary of the Company’s non-vested options to purchase shares as of December 31, 2013 and changes during the year ended December 31, 2013 and December 31, 2012 are presented below:
 
 
 
Non-Vested Options
 
 
 
Number of
Options
  
Weighted
Average
Exercise Price
 
 
 
  
 
Non-vested at December 31, 2011
  
1,158,368
  
$
6.44
 
Granted
  
1,207,452
   
3.80
 
Vested
  
(570,518
)
  
6.38
 
Forfeited
  
(111,950
)
  
4.79
 
Non-vested at December 31, 2012
  
1,683,352
  
$
4.68
 
Granted
  
2,085,717
   
1.09
 
Vested
  
(686,232
)
  
5.38
 
Forfeited
  
(1,184,479
)
  
3.37
 
Non-vested at December 31, 2013
  
1,898,358
   
1.30
 
Restricted stock activity
A summary of the Company’s restricted stock activity as of December 31, 2013 and changes during the year ended December 31, 2013 and December 31, 2012 are presented below:
 
 
 
Restricted Stock Activity
 
 
 
Number of Shares
  
Weighted Average
Grant Date Fair
Value
 
 
 
  
 
Non-vested at December 31, 2011
  
193,532
  
$
5.84
 
Granted
  
429,720
   
2.83
 
Vested
  
(100,751
)
  
6.18
 
Forfeited
  
(21,033
)
  
4.39
 
Non-vested at December 31, 2012
  
501,468
  
$
3.26
 
Granted
  
276,250
   
0.42
 
Vested
  
(313,395
)
  
2.57
 
Forfeited
  
(138,601
)
  
4.32
 
Non-vested at December 31, 2013
  
325,722
  
$
1.05
 
Warrant activity
A summary of warrant activity is as follows: 
 
 
Warrants
  
Exercise Price
per Share
  
Weighted
Average
Exercise Price
  
Weighted Average
Remaining Life
(Years)
 
 
 
  
  
  
 
Outstanding at December 31, 2010
  
2,512,934
  
$
3.44-3.60
  
$
3.51
   
2.45
 
Issued
  
–
             
Exercised
  
–
             
Expired
  
–
             
Outstanding at December 31, 2011
  
2,512,934
  
$
3.44-3.60
  
$
3.51
   
1.45
 
Issued
  
6,523,120
   
1.49-3.03
   
1.65
     
Exercised
  
(2,975,457
)
  
1.49-1.65
   
1.49
     
Expired
  
(418,017
)
  
1.49
   
1.49
     
Outstanding at December 31, 2012
  
5,642,580
  
$
1.20
  
$
1.20
   
2.24
 
Issued
  
9,432,000
   
0.44
   
0.44
     
Exercised
  
(202,689
)
  
1.20
   
1.20
     
Expired
  
–
             
Outstanding at December 31, 2013
  
14,871,891
  
$
0.16-0.44
  
$
0.34
   
3.51
 
Stock Options [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Assumptions used to determine the fair value of stock options
The estimated fair value of each option award granted was determined on the date of grant using an option pricing model with the following assumptions for option grants during the years ended December 31, 2013, 2012 and 2011: 

 
 
Year Ended December 31,
 
 
 
2013
  
2012
  
2011
 
Weighted average risk-free interest rate
  
1.30
%
  
1.11
%
  
2.07
%
Weighted average expected volatility
  
92.31
%
  
79.89
%
  
74.64
%
Expected volatility
  
86.16-97.21
%
  
77.37-84.81
%
  
73.88% - 79.11
%
Dividend yield
  
0.00
%
  
0.00
%
  
0.00
%
Weighted average expected option term (in years)
  
5.66
   
6.17
   
6.00
 
Weighted average grant date fair value
 
$
0.81
  
$
2.59
  
$
3.79
 
Compensation expense recognized granted to employees
Compensation expense recognized relating to stock options granted to employees (in millions):

 
 
2013
  
2012
  
2011
 
Selling, general and administrative
 
$
0.2
  
$
1.7
  
$
2.2
 
Research and development
  
0.0
   
1.1
   
1.4
 
Total
 
$
0.2
  
$
2.8
  
$
3.6
 
Restricted Stock [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Compensation expense recognized granted to employees
Compensation expense recognized relating to restricted stock granted to employees (in millions):

 
 
2013
  
2012
  
2011
 
Selling, general and administrative
 
$
0.2
  
$
0.7
  
$
0.5
 
Research and development
  
0.0
   
0.3
   
0.1
 
Total
 
$
0.2
  
$
1.0
  
$
0.6
 
Warrant [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Assumptions used to determine the fair value of stock options
The fair value of the Warrants at December 31, 2013 was determined by using an option pricing model assuming the following:
 
 
 
2013 Warrants
  
2012 Warrants
  
2009 Warrants
 
Expected volatility
  
90.75
%
  
106.77
%
  
128.50
%
Risk-free interest rates
  
1.63
%
  
0.26
%
  
0.10
%
Expected life (in years)
  
4.83
   
1.41
   
0.45