Annual report pursuant to Section 13 and 15(d)

Common Stock - Additional Information (Detail)

v3.3.1.900
Common Stock - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Apr. 11, 2014
Aug. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Jun. 30, 2013
Common Stock [Line Items]          
Common stock, shares authorized     150,000,000 150,000,000  
Common stock, par value     $ 0.0001 $ 0.0001  
Common stock, shares issued   541,948 37,605,134 25,938,332  
Common stock, shares outstanding     37,605,134 25,938,332  
Net proceeds from common stock     $ 11,328,929 $ 10,305,161  
Number of common stock called by warrants   162,539 1,969,250 33,333 301,778
Common stock exercised under cashless exercise provision       21,500  
Net proceeds from exercise of stock options and warrants     $ 10,819,714    
Common stock issued upon the exercise of stock options and warrants     11,666,802    
Warrant exercisable term   5 years      
Net proceeds after deducting offering expense     $ 8,402,000 $ 8,402,000  
Stock Options [Member]          
Common Stock [Line Items]          
Common stock, shares issued       87,691  
Net proceeds from common stock       $ 4,450  
Common Stock [Member]          
Common Stock [Line Items]          
Conversion of stock, shares issued 2,035,212        
Aggregate common stock sold, shares       6,000,000  
Fair value of stock and warrants       $ 600  
Warrant [Member]          
Common Stock [Line Items]          
Common stock, shares issued       33,333  
Net proceeds from common stock       $ 33,333  
Shares issued under cashless exercise of options       15,360  
Series A Convertible Preferred Stock [Member]          
Common Stock [Line Items]          
Preferred Stock converted, shares 1,835,212        
Series A Non-Convertible Preferred Stock [Member]          
Common Stock [Line Items]          
Preferred Stock converted, shares 200,000        
2014 Private Placement [Member]          
Common Stock [Line Items]          
Common stock, shares issued 6,000,000        
Number of common stock called by warrants     10,260,000    
Common stock warrants, exercise price     $ 1.00    
Warrant exercisable term     5 years    
Fair value of stock and warrants     $ 10,260,000    
2014 Private Placement [Member] | Placement Agent [Member]          
Common Stock [Line Items]          
Number of common stock called by warrants     2,047,000    
Common stock warrants, exercise price     $ 1.00    
Warrant exercisable term     5 years    
Placement agent, cash fee     $ 1,023,000    
Placement agent, non-accountable expense     $ 308,000    
2014 Private Placement [Member] | Common Stock [Member]          
Common Stock [Line Items]          
Aggregate common stock sold, shares     10,260,000    
Fair value of stock and warrants     $ 5,349,000    
2014 Private Placement [Member] | Warrant [Member]          
Common Stock [Line Items]          
Fair value of stock and warrants     $ 4,911,000