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Share-Based Compensation Share-Based Compensation (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense $ 4,416,300 $ 1,759,700 $ 8,132,100 $ 5,653,500  
Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost 4,979,600   $ 4,979,600    
Expected weighted-average period in years of compensation cost to be recognized     3 years 3 months 15 days    
Warrants          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost $ 1,000   $ 1,000    
Expected weighted-average period in years of compensation cost to be recognized     18 days    
Total fair value of shares vested     $ 14,000 15,000  
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 $ 2.17   $ 2.17   $ 4.92
Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost $ 401,200   $ 401,200    
Expected weighted-average period in years of compensation cost to be recognized     2 years 11 months 5 days    
Cost of revenue          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense 378,200 98,500 $ 495,100 236,600  
Research and development          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense 1,104,200 371,600 1,526,900 848,400  
Selling, General and Administrative Expenses [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense $ 2,933,900 $ 1,289,600 6,110,100 4,568,500  
Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total fair value of shares vested     $ 4,915,300 $ 2,552,200