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Stock-Based Compensation (Details)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Risk-free interest rate (Minimum) 1.25% 1.49%
Risk-free interest rate (Maximum) 1.47% 2.90%
Expected life (years) 4 years 9 months  
Expected life (years) (Minimum)   4 years 9 months
Expected life (years) (Maximum)   6 years 9 months 18 days
Expected volatility (Minimum) 133.00% 262.00%
Expected volatility (maximum) 135.00% 323.00%
Expected dividend yield 0.00% 0.00%
Expected forfeitures 0.00% 0.00%