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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The fair value of each stock option granted during the year was estimated on the date of grant using the Black-Scholes option pricing model with the following weighted average assumptions:
 
 
2013
 
2012
 
2011
Expected life (years)
 
5.4

 
5.5

 
5.5

Expected volatility
 
89.6
%
 
92.4
%
 
92.6
%
Expected dividend yield
 
—

 
—

 
—

Risk-free interest rate
 
1.5
%
 
0.7
%
 
1.6
%
Weighted average fair value of options granted during the year
 
$0.34
 
$0.47
 
$0.69
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes stock option activity for the year ended December 31, 2013:
 
 
 
 
 
 
Weighted
 
 
 
 
 
 
Weighted Average
 
Average Remaining
 
Aggregate Intrinsic
 
 
 Number of Shares
 
Exercise Price Per Share
 
Contractual Life (years)
 
 Value (in thousands)
Outstanding at December 31, 2012
 
6,429,250

 
$1.28
 
 
 
 
Granted
 
2,325,000

 
$0.47
 
 
 
 
Exercised
 
(182,930
)
 
0.39

 
 
 
 
Expired
 
(2,514,070
)
 
$1.96
 
 
 
 
Forfeited
 
(1,906,700
)
 
$0.54
 
 
 
 
Outstanding at December 31, 2013
 
4,150,550

 
$0.75
 
8.3
 
$2
Exercisable at December 31, 2013
 
1,907,350

 
$1.04
 
6.8
 
$2