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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
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:
 
 
2012
 
2011
 
2010
Expected life (years)
 
5.5

 
5.5
 
5.4

Expected volatility
 
92.4
%
 
92.6
%
 
91.9
%
Expected dividend yield
 
—

 
—

 
—

Risk-free interest rate
 
0.7
%
 
1.6
%
 
1.7
%
Weighted average fair value of options granted during the year
 
$0.47
 
$0.69
 
$0.49
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes stock option activity for the year ended December 31, 2012:
 
 
 
 
 
 
Weighted
 
 
 
 
 
 
Weighted Average
 
Average Remaining
 
Aggregate Intrinsic
 
 
 Number of Shares
 
Exercise Price Per Share
 
Contractual Life (years)
 
 Value (in thousands)
Outstanding at December 31, 2011
 
5,988,500

 
$1.68
 
 
 
 
Granted
 
2,125,000

 
$0.65
 
 
 
 
Exercised
 
—

 
—

 
 
 
 
Expired
 
(822,900
)
 
$3.12
 
 
 
 
Forfeited
 
(861,350
)
 
$0.76
 
 
 
 
Outstanding at December 31, 2012
 
6,429,250

 
$1.28
 
6.9
 
$14
Exercisable at December 31, 2012
 
3,105,500

 
$1.92
 
5.2
 
$7