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Subsequent Events - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Mar. 31, 2016
May. 31, 2015
Apr. 30, 2015
Jul. 31, 2014
Oct. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Subsequent Event [Line Items]                
Proceeds from issuance of stock units   $ 25,000,000       $ 26,324,565 $ 18,949,647 $ 23,491,597
Number of stock units issued     35,715,000 11,299,435 12,845,500      
Number of shares called by warrants           1    
Warrant exercise price     $ 0.85 $ 2.17 $ 1.80      
Warrant expiration period     5 years 13 months 5 years      
Over-Allotment-Option [Member]                
Subsequent Event [Line Items]                
Proceeds from issuance of stock units   $ 1,800,000            
Number of stock units issued   2,757,250 5,357,250          
Number of stock units issued, price per share   $ 0.699 $ 0.85          
Series A Warrants [Member]                
Subsequent Event [Line Items]                
Number of shares called by warrants           1    
Subsequent Events [Member]                
Subsequent Event [Line Items]                
Warrant expiration period 2 years              
Term of warrant 5 years              
Subsequent Events [Member] | Underwritten Public Offering [Member]                
Subsequent Event [Line Items]                
Proceeds from issuance of stock units $ 8,000,000              
Number of stock units issued 26,667,000              
Number of stock units issued, price per share $ 0.30              
Subsequent Events [Member] | Over-Allotment-Option [Member]                
Subsequent Event [Line Items]                
Number of stock units issued 4,000,050              
Number of shares called by warrants 5,000,063              
Underwriting option exercise period 45 days              
Subsequent Events [Member] | Series A Warrants [Member]                
Subsequent Event [Line Items]                
Number of shares called by warrants 0.50              
Warrant exercise price $ 0.30              
Subsequent Events [Member] | Series B Warrants [Member]                
Subsequent Event [Line Items]                
Number of shares called by warrants 0.75              
Warrant exercise price $ 0.42