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Stockholders' Equity (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]    
Risk-free interest rate, minimum 0.62% 0.62%
Risk-free interest rate, maximum 5.11% 5.11%
Expected volatility, minimum 91.99% 93.63%
Expected volatility, maximum 180.36% 147.40%
Expected dividend yield $ 0 $ 0
Estimated average forfeiture rate 10.00% 11.00%
Minimum [Member]
   
Fair value assumptions, stock options    
Expected life 2 years 10 months 2 years 10 months
Maximum [Member]
   
Fair value assumptions, stock options    
Expected life 7 years 7 years