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Employee Benefit Plan and Non-Qualified Stock Option and Compensation Plan (Summary of Status of Options Outstanding, 2008 Long Term Incentive Plan) (Details) (2008 Long-Term Incentive Plan [Member], USD $)
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
2008 Long-Term Incentive Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range of exercise prices, minimum $ 0.60  
Range of exercise prices, maximum $ 3.39  
Options Outstanding    
Total options outstanding 20,070,397 12,205,717
Weighted average remaining contractual life (years) 4 years 1 month 28 days  
Weighted average exercise price $ 1.63 $ 2.15
Options Exercisable    
Options exercisable 13,075,951  
Weighted average exercise price $ 1.52  
Unvested Options    
Number of options not yet vested 6,994,446  
Forfeiture rate used for this period ending 9.317%  
Options expected to vest    
Number of options expected to vest corrected by forfeiture rate 6,342,764  
Unrecognized stock-based compensation expense $ 3,875,450  
Weighted average remaining contract life of Total Options expected to vest (in years) 3 years 10 months 6 days  
Weighted average assumptions for 2013 grants:    
Weighted Average Annual Volatility 80.00%  
Weighted Average Cumulative Volatility 120.00%  
Weighted Average Contractual Life (in years) 3 years 4 months 6 days  
Weighted Average Expected Option life (in years) 2 years 3 months 26 days  
Weighted Average Risk Free Interest Rate 0.287%  
Dividend yield 0.00%