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Stock-Based Compensation (Details 2)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Stock Based Compensation [Line Items]    
Expected volatility - Low 73.03% 75.02%
Expected volatility - High 74.03% 76.49%
Expected dividends - Low 0.00% 0.00%
Expected dividends - High 0.00% 0.00%
Risk free rate - Low 1.16% 0.55%
Risk free rate - High 2.52% 1.91%
Minimum [Member]
   
Stock Based Compensation [Line Items]    
Expected term (in years) 3 years 8 months 23 days 3 years 8 months 23 days
Maximum [Member]
   
Stock Based Compensation [Line Items]    
Expected term (in years) 9 years 1 month 10 days 9 years 5 months 19 days