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Stockholders' Equity, Equity Incentive Plans and Warrants (Schedule of Fair Value Assumptions) (Details)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Forfeiture Rate, Minimum 0.00% 0.00% 0.00%
Forfeiture Rate, Maximum 12.25% 12.69% 12.37%
EIP and NEDSOP [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate 1.19% 1.84% 2.25%
Expected dividend yield 0.00% 0.00% 0.00%
Volatility 81.00% 85.00% 74.00%
Expected Term 5 years 2 months 12 days 5 years 4 months 10 days 5 years 10 months 24 days
2000ESPP [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate 0.12% 0.17% 0.19%
Expected dividend yield 0.00% 0.00% 0.00%
Volatility 64.00% 70.00% 101.00%
Expected Term 6 months 6 months 6 months
Forfeiture Rate 0.00% 0.00% 0.00%