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Share-Based Compensation Share-Based Compensation (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense $ 436,500 $ 3,287,900 $ 8,568,500 $ 8,941,500  
Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost 3,898,600   $ 3,898,600    
Expected weighted-average period in years of compensation cost to be recognized     3 years 3 months 7 days    
Warrants          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost $ 0   $ 0    
Expected weighted-average period in years of compensation cost to be recognized        
Total fair value of shares vested     $ 0 15,300  
Weighted average estimated fair value of shares granted $ 0.00   $ 0.00   $ 0.00
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average estimated fair value of shares granted $ 2.10   $ 2.10   $ 4.67
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost $ 336,500   $ 336,500    
Expected weighted-average period in years of compensation cost to be recognized     2 years 8 months 1 day    
Cost of revenue          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense 14,400 55,900 $ 509,500 292,600  
Research and development          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense 115,900 515,700 1,642,800 1,364,200  
Selling, General and Administrative Expenses [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense $ 306,200 $ 2,716,300 6,416,200 7,284,700  
Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total fair value of shares vested     $ 5,303,900 $ 4,141,600