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Stockholders' Equity, Equity Incentive Plans and Warrants (Schedule of Fair Value Assumptions) (Details)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Forfeiture Rate, Minimum 0.00% 0.00% 0.00%
Forfeiture Rate, Maximum 9.45% 10.62% 12.25%
EIP and NEDSOP [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate 1.07% 1.19% 1.84%
Expected dividend yield 0.00% 0.00% 0.00%
Volatility 82.00% 81.00% 85.00%
Expected Term 5 years 3 months 18 days 5 years 2 months 10 days 5 years 4 months 24 days
2000ESPP [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Risk-free interest rate 0.09% 0.12% 0.17%
Expected dividend yield 0.00% 0.00% 0.00%
Volatility 63.00% 64.00% 70.00%
Expected Term 6 months 6 months 6 months
Forfeiture Rate 0.00% 0.00% 0.00%