Statements of Stockholders' Equity - USD ($)
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Beginning Balance at Dec. 31, 2013 $ 21,183,261 $ 610 $ 43,874,119 $ (22,691,468)
Beginning Balance, Shares at Dec. 31, 2013   6,096,752    
Stock-based compensation expense 1,102,087   1,102,087  
Issuance of common stock upon exercise of warrant, Shares   2,795    
Issuance of common stock upon exercise of stock option 1,522   1,522  
Issuance of common stock upon exercise of stock option, Shares   5,250    
Issuance of common stock from employee stock purchase plan $ 41,353 $ 1 41,352  
Issuance of common stock from employee stock purchase plan, Shares 7,294 7,294    
Fair market value of issued warrant $ 108,122   108,122  
Net loss (13,247,681)     (13,247,681)
Ending Balance at Dec. 31, 2014 $ 9,188,664 $ 611 45,127,202 (35,939,149)
Ending Balance, Shares at Dec. 31, 2014 6,112,091 6,112,091    
Stock-based compensation expense $ 1,504,356   1,504,356  
Issuance of common stock from At-The-Market offering, net 4,723,572 $ 105 4,723,467  
Issuance of common stock from At-The-Market offering, shares net   1,048,507    
Issuance of common stock from employee stock purchase plan $ 169,800 $ 4 169,796  
Issuance of common stock from employee stock purchase plan, Shares 41,176 41,176    
Net loss $ (12,121,463)     (12,121,463)
Ending Balance at Dec. 31, 2015 $ 3,464,929 $ 720 $ 51,524,821 $ (48,060,612)
Ending Balance, Shares at Dec. 31, 2015 7,201,774 7,201,774