Quarterly report pursuant to Section 13 or 15(d)

Debt (Details)

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Debt (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2015
Aug. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Oct. 20, 2015
Dec. 31, 2014
Debt                
Term loan     $ 6,476,202   $ 6,476,202     $ 7,500,000
Less: debt discount     (151,950)   (151,950)     (285,910)
Term Loan, net of debt discount     6,324,252   6,324,252     7,214,090
Less: current portion, net of debt discount     (3,128,785)   (3,128,785)     (1,905,879)
Long term debt, net of current portion and debt discount     3,195,467   3,195,467     $ 5,308,211
Interest expense     $ 197,470 $ 189,679 634,772 $ 983,717    
Series B converitible preferred stock warrants                
Debt                
Number of shares available under warrant   625,208            
Exercise price per share (in dollars per share)   $ 0.2999            
Common stock warrants | IPO | Subsequent events                
Debt                
Number of shares available under warrant             22,328  
Exercise price per share (in dollars per share)             $ 8.40  
Term loan                
Debt                
Face amount   $ 7,500,000            
Stated interest rate, minimum   7.95%            
Current interest rate   7.95%            
Term of interest-only period   9 months            
Monthly payments of principal and interest   $ 304,278            
Monthly payments of principal and interest, term 27 months              
Interest expense         $ 640,000      
Term loan | Series B converitible preferred stock warrants                
Debt                
Number of shares available under warrant   625,208            
Exercise price per share (in dollars per share)   $ 0.2999            
Exercisable term following an IPO   5 years            
Term loan | Prime rate                
Debt                
Variable interest rate, deducted from basis   3.25%