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Stock Option Plans (Schedule of Assumptions Used to Estimate Share-Based Compensation Expense Using Black-Scholes Model) (Details)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected dividend yield      
Expected term (in years) 6 years 3 months [1] 6 years 3 months [1]
Forfeiture rate 7.00% 7.00%
Minimum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk free interest rate 1.03% 1.22%
Expected volatility 104.00% 101.10%
Maximum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk free interest rate 1.14% 1.38%
Expected volatility 104.90% 101.70%
[1] Expected term is calculated using SAB 107, Simplified Formula. Management has concluded that the use of the simplified method for calculating the expected term of its common stock option grants is appropriate given the Company's lack of history of option exercises.