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Stockholders' Equity (Schedule of Valuation Assumptions) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average volatility 86.00% 83.00% 87.00%
Risk-free interest rate, minimum 0.79% 0.79% 0.28%
Risk-free interest rate, maximum 1.18% 2.79% 3.20%
Expected annual dividend yield 0.00% 0.00% 0.00%
Expected weighted-average life, in years 5 years 10 months 24 days 5 years 10 months 24 days 6 years
Annual dividends $ 0    
Weighted Average Volatility Calculation 50.00%