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Stock-Based Compensation (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation     $ 4,548,445 $ 1,338,427
Total unrecognized compensation cost related to unvested stock options 5,800,000   5,800,000  
Period over which total unrecognized compensation cost related to unvested stock options will be recognized     2 years 1 month 0 days  
Weighted average grant date fair value per share $ 6.51 $ 5.24 $ 9.32 $ 1.76
Non Employee [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation 88,000 295,000 547,000 418,000
Employees and Directors [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation 708,000 250,000 4,000,000 920,000
Employees and Directors [Member] | Stock Options [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate 0.93% 0.68% 1.49% 0.40%
Expected volatility 79.00% 76.00% 110.00% 111.00%
Expected life 5 years 0 months 4 years 0 months 5 years 1 month 4 years
Dividend yield 0.00% 0.00% 0.00% 0.00%
Dividend yield 8.00% 8.00% 8.00% 8.00%
Research and Development Expense [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense 410,000 105,000 2,400,000 439,000
General and Administrative Expense [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated share-based compensation expense $ 298,000 $ 145,000 $ 1,600,000 $ 481,000