Quarterly report pursuant to Section 13 or 15(d)

Equity (Details Textual)

v3.3.0.814
Equity (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 09, 2015
Jun. 03, 2015
May. 07, 2015
May. 04, 2015
Mar. 09, 2015
Feb. 11, 2015
Sep. 01, 2015
Aug. 24, 2015
Aug. 17, 2015
Feb. 18, 2015
Feb. 18, 2015
Apr. 17, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Equity (Textual)                                  
Net proceeds from sale of stock                             $ 2,350,332    
Underwritten offering common stock, Shares                             1,044,672    
Warrants issued to purchase common stock, shares                             153,459    
Proceeds from Stock Options Exercised                             $ 119,780    
Number of shares, exercised                             1,223,641    
Stock-based compensation expense                             $ 6,307,799 $ 5,221,673  
Fair value assumptions, expected term                             2 years 6 months   3 years
Fair value assumptions, expected volatility rate [1]                             90.00%   71.00%
Fair value assumptions, expected dividend rate [2]                              
Expense related to common stock granted                         $ 800,000 $ 700,000 $ 2,700,000 1,600,000  
Warrants to purchase common stock expected to vest, shares                             150,000    
Issuance and sale of common stock and warrants                       $ 200,000,000          
Proceeds from common stock issued                             $ 2,423,209    
Underwriting agreement, description                             In addition, the Company granted the underwriters a 30-day option to purchase up to an additional 666,666 shares of common stock and warrants to purchase 499,999 shares of common stock solely to cover over-allotments, if any. The underwriter did not exercise the over-allotment option.    
Restricted shares issued                             547,269    
Investor [Member]                                  
Equity (Textual)                                  
Net proceeds from sale of stock $ 4,480,000                                
Shares purchased by investors 1,923,078                                
Price per share $ 2.60                                
Proceeds from common stock issued $ 5,000,000                                
Sales Agreement [Member] | MLV & Co. LLC [Member]                                  
Equity (Textual)                                  
Issuance and sale of common stock and warrants                       $ 75,000,000          
Public Offering [Member]                                  
Equity (Textual)                                  
Net proceeds from sale of stock           $ 18,500,000                      
Price per share           $ 4.50                      
Underwritten offering common stock, Shares           4,444,444                      
Warrants issued to purchase common stock, shares           3,333,333                 499,999    
Exercise price of warrants           $ 6.50                      
Term of warrants           4 years                      
Fair value of warrants           $ 3,540,659                      
Warrants/ Common stock granted                             666,666    
Warrants [Member]                                  
Equity (Textual)                                  
Price per share           $ 4.50                      
Underwritten offering common stock, Shares           4,444,444                      
Warrants issued to purchase common stock, shares           3,333,333                      
Exercise price of warrants           $ 6.50                      
Term of warrants           4 years                      
Warrants exercised by warrant holders                             1,524,893    
Number of shares, exercised                             1,357,100    
Stock-based compensation expense                         57,772 0 $ 171,432 98,224  
Fair value of warrants           $ 3,540,659                      
Stock Options [Member]                                  
Equity (Textual)                                  
Number of shares, exercised                             (20,000)    
Number of stock option granted                             1,364,499    
Share-based Compensation, Term                             8 years 4 months 6 days    
Stock option exercise price                             $ 0.78    
Fair value assumptions, expected discount rate   1.91% 1.70% 1.71% 1.83%   1.65% 1.58% 1.75% 1.69%              
Fair value assumptions, expected term   6 years 6 years 6 years 6 years   6 years 6 years 6 years 6 years              
Fair value assumptions, expected volatility rate   85.01% 85.01% 85.01% 86.29%   92.60% 92.60% 92.60% 86.29%              
Fair value assumptions, expected dividend rate   0.00% 0.00% 0.00% 0.00%   0.00% 0.00% 0.00% 0.00%              
Fair value of warrants determined utilizing the Black-Scholes option pricing model                                
Stock Options [Member] | Option One [Member]                                  
Equity (Textual)                                  
Stock-based compensation expense                             $ 208,078    
Stock Options [Member] | Option Two [Member]                                  
Equity (Textual)                                  
Stock-based compensation expense                             1,481    
Stock Options [Member] | Option Three [Member]                                  
Equity (Textual)                                  
Stock-based compensation expense                             38,644    
Stock Options [Member] | Option Four [Member]                                  
Equity (Textual)                                  
Stock-based compensation expense                             14,125    
Stock Options [Member] | Option Five [Member]                                  
Equity (Textual)                                  
Stock-based compensation expense                             13,337    
Stock Options [Member] | Option Six [Member]                                  
Equity (Textual)                                  
Stock-based compensation expense                             3,656    
Stock Options [Member] | Option Seven [Member]                                  
Equity (Textual)                                  
Stock-based compensation expense                             1,585    
Stock Options [Member] | Employees and Board Members [Member]                                  
Equity (Textual)                                  
Number of stock option granted                   531,000              
Share-based Compensation vesting period                   4 years              
Share-based Compensation, Term                   10 years              
Stock option exercise price                   $ 3.58              
Fair value of warrants determined utilizing the Black-Scholes option pricing model                     $ 1,400,000            
Stock Options [Member] | Employees [Member]                                  
Equity (Textual)                                  
Number of stock option granted   76,000 152,499 200,000 5,000   50,000 100,000 250,000                
Share-based Compensation vesting period   4 years 4 years 4 years 4 years   4 years 4 years 4 years                
Share-based Compensation, Term   10 years 10 years 10 years 10 years   10 years 10 years 10 years                
Stock option exercise price   $ 2.99 $ 2.52 $ 2.64 $ 2.91   $ 2.11 $ 1.91 $ 2.34                
Fair value of warrants determined utilizing the Black-Scholes option pricing model   $ 163,359 $ 275,572 $ 378,664 $ 11,000   $ 79,790 $ 144,249 $ 442,538                
Restricted Stock [Member]                                  
Equity (Textual)                                  
Stock-based compensation expense                         $ 300,000 $ 150,000 $ 3,500,000 $ 400,000  
Share-based Compensation vesting period                             6 months    
Number of additional stock option granted                             2,277,582    
Warrants to purchase common stock expected to vest, shares                             329,650    
Restricted shares issued                             479,650    
Restricted Stock [Member] | Employees [Member]                                  
Equity (Textual)                                  
Number of shares, exercised                             152,499    
Expense related to common stock granted                             $ 852,681    
Restricted stock cancelled                             126,265    
[1] As of September 30, 2015, the volatility was estimated using the historical volatilities of the Company's common stock traded in NYSE MKT market. As of December 31, 2014, the volatility was estimated using the historical volatilities of comparable companies in the same industry and region.
[2] Management determined the dividend yield to be 0% based upon its expectation that it will not pay dividends for the foreseeable future.