Quarterly report pursuant to Section 13 or 15(d)

Equity (Details Textual)

v3.2.0.727
Equity (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 09, 2015
Jun. 03, 2015
May. 07, 2015
May. 04, 2015
Mar. 09, 2015
Feb. 11, 2015
Feb. 18, 2015
Feb. 18, 2015
Apr. 17, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Equity (Textual)                            
Underwritten offering common stock, Shares                   2,609,001   2,609,501    
Warrants issued to purchase common stock, shares                       54,680    
Exercise price of warrants           $ 6.50                
Number of shares, exercised                       1,021,577    
Stock-based compensation expense                       $ 5,174,221 $ 3,141,144  
Fair value assumptions, expected term                       2 years 6 months   3 years
Fair value assumptions, expected volatility rate [1]                       70.00%   71.00%
Fair value assumptions, expected dividend rate [2]                            
Expense related to common stock granted                   $ 900,000 $ 600,000 $ 1,900,000 900,000  
Warrants to purchase common stock expected to vest, shares                       75,000    
Restricted shares issued                       462,257    
Issuance and sale of common stock and warrants                 $ 200,000,000          
Proceeds from common stock issued                   7,742,451   $ 7,748,451    
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.    
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                          
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                
Underwritten offering common stock, Shares           4,444,444                
Warrants issued to purchase common stock, shares           3,333,333           499,999    
Exercise price of warrants           $ 4.50                
Term of warrants           4 years                
Fair value of warrants           $ 3,540,659                
Warrants/ Common stock granted                       666,666    
Warrants [Member]                            
Equity (Textual)                            
Underwritten offering common stock, Shares           4,444,444                
Warrants issued to purchase common stock, shares           3,333,333                
Exercise price of warrants           $ 4.50                
Term of warrants           4 years                
Warrants exercised by warrant holders                       1,115,810    
Number of shares, exercised                       1,056,257    
Stock-based compensation expense                   57,144 $ 39,290 $ 113,660 $ 98,224  
Fair value of warrants           $ 3,540,659                
Stock Options [Member]                            
Equity (Textual)                            
Number of shares, exercised                       (20,000)    
Stock-based compensation expense   $ 3,023   $ 14,783     $ 127,188     $ 658   $ 817    
Number of stock option granted                       964,499    
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%   1.69%              
Fair value assumptions, expected term   6 years 6 years 6 years 6 years   6 years              
Fair value assumptions, expected volatility rate   85.01% 85.01% 85.01% 86.29%   86.29%              
Fair value assumptions, expected dividend rate   0.00% 0.00% 0.00% 0.00%   0.00%              
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                  
Share-based Compensation vesting period   4 years 4 years 4 years 4 years                  
Share-based Compensation, Term   10 years 10 years 10 years 10 years                  
Stock option exercise price   $ 2.99 $ 2.52 $ 2.64 $ 2.91                  
Fair value of warrants determined utilizing the Black-Scholes option pricing model   $ 163,359 $ 275,572 $ 378,664 $ 11,000                  
Restricted Stock [Member]                            
Equity (Textual)                            
Share-based Compensation vesting period                       6 months    
Restricted stock granted value                       $ 374,889    
Number of additional stock option granted                       2,101,582    
Warrants to purchase common stock expected to vest, shares                       299,889    
Restricted stock granted remain outstanding                       104,708    
Restricted shares issued                       374,889    
Restricted Stock [Member] | Employees [Member]                            
Equity (Textual)                            
Number of shares, exercised                       152,499    
Expense related to common stock granted                       $ 889,661    
Restricted stock cancelled                       126,265    
[1] Because the Company does not have adequate trading history to determine its historical trading volatility, the volatility factor was estimated by management 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.