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Share-Based Compensation Share-Based Compensation (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense $ 3,893,600 $ 2,218,500  
Stock Option [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost 6,490,000    
Expected weighted-average period in years of compensation cost to be recognized 5 years 7 months 13 days    
Warrants
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost 46,200    
Expected weighted-average period in years of compensation cost to be recognized 1 year 3 months 18 days    
Total fair value of shares vested 8,700 43,800  
Weighted average estimated fair value of shares granted $ 0.00   $ 3.82
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average estimated fair value of shares granted $ 5.47   $ 4.71
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost 208,200    
Expected weighted-average period in years of compensation cost to be recognized 4 months 6 days    
Cost of revenue
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense 138,100 86,400  
Research and development
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense 476,800 217,400  
Selling, general and administrative
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense 3,278,700 1,914,700  
Stock Option [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total fair value of shares vested $ 1,927,400 $ 1,305,000