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Derivative Financial Instruments (Details 5) (Binomial Lattice Technique [Member], USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Level 1 [Member]
      
Significant assumptions utilized in valuation technique      
Linked common shares 1,800,000 1,800,000 1,800,000
Quoted market price on valuation date $ 3.725 $ 3.13 $ 2.74
Contractual exercise rate 250.00% 250.00% 250.00%
Trem (years) 1 year 3 months 11 days 2 years 3 months 11 days 1 year 9 months 11 days
Level 1 [Member] | Minimum [Member]
      
Significant assumptions utilized in valuation technique      
Range of market volatilities 48.70% 61.00% 56.80%
Risk free rates using zero coupon US Treasury 0.04% 0.03% 0.02%
Level 1 [Member] | Maximum [Member]
      
Significant assumptions utilized in valuation technique      
Range of market volatilities 73.10% 72.80% 101.60%
Risk free rates using zero coupon US Treasury 0.27% 0.81% 0.25%
Level 2 [Member]
      
Significant assumptions utilized in valuation technique      
Linked common shares 525,000 525,000 525,000
Quoted market price on valuation date $ 3.725 $ 3.13 $ 2.74
Contractual exercise rate 275.00% 250.00% 275.00%
Trem (years) 1 year 9 months 15 days 2 years 3 months 11 days 2 years 3 months 11 days
Level 2 [Member] | Minimum [Member]
      
Significant assumptions utilized in valuation technique      
Range of market volatilities 48.90% 61.00% 56.90%
Risk free rates using zero coupon US Treasury 0.04% 0.03% 0.02%
Level 2 [Member] | Maximum [Member]
      
Significant assumptions utilized in valuation technique      
Range of market volatilities 72.20% 72.80% 94.00%
Risk free rates using zero coupon US Treasury 0.27% 0.81% 0.25%
Level 3 [Member]
      
Significant assumptions utilized in valuation technique      
Linked common shares 1,562,500   1,302,083
Quoted market price on valuation date $ 3.725   $ 2.74
Contractual exercise rate 360.00%   432.00%
Trem (years) 4 years 10 months 10 days   5 years 4 months 6 days
Custom lattice variable: Probability of exercisability (434,027 linked common shares)      60.00%
Level 3 [Member] | Minimum [Member]
      
Significant assumptions utilized in valuation technique      
Range of market volatilities 48.80%   67.20%
Risk free rates using zero coupon US Treasury 0.09%   0.02%
Level 3 [Member] | Maximum [Member]
      
Significant assumptions utilized in valuation technique      
Range of market volatilities 72.50%   87.50%
Risk free rates using zero coupon US Treasury 0.72%   0.83%