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Summary of Significant Accounting Policies - Additional Information (Detail)
 1 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2015
shares
Dec. 31, 2011
$ / shares
shares
Jun. 30, 2012
shares
Sep. 30, 2015
USD ($)
Segment
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
shares
Dec. 31, 2012
shares
Dec. 31, 2011
$ / shares
shares
Apr. 30, 2015
$ / shares
Class of Warrant or Right [Line Items]                  
Number of segments | Segment       1          
Maturity period for market accounts, money market funds and investments       90 days          
Fair value of warrant liability | $       $ 615,925 $ 1,684,551        
Value of patent | $       0          
Accumulated other comprehensive income | $       $ 46,873 $ 65,390        
Series A Warrants [Member]                  
Class of Warrant or Right [Line Items]                  
Number of securities callable by each warrant or right warrants       1          
Warrants [Member]                  
Class of Warrant or Right [Line Items]                  
Fair value of warrant liability | $       $ 616,000          
Common Stock [Member]                  
Class of Warrant or Right [Line Items]                  
Number of securities callable by each warrant or right warrants       1          
December 2011 Financing [Member] | Series A Warrants [Member]                  
Class of Warrant or Right [Line Items]                  
Number of securities callable by warrants   8,000,000           8,000,000  
Term of warrant   5 years              
Number of warrants exercised         1,180,015 384,534 2,198,571    
Number of warrants issued upon Series B warrants exercise     2,700,000       2,700,000    
December 2011 Financing [Member] | Series B Warrants [Member]                  
Class of Warrant or Right [Line Items]                  
Number of securities callable by warrants   8,000,000           8,000,000  
Exercise price of warrants | $ / shares   $ 1.25           $ 1.25  
Term of warrant   90 days           90 days  
Number of warrants exercised     2,700,000       2,700,000    
Number of warrants expired     5,300,000 5,300,000          
December 2011 Financing [Member] | Common Stock [Member]                  
Class of Warrant or Right [Line Items]                  
Number of securities callable by each warrant or right warrants   1           1  
Number of shares issued upon Series B warrants exercise     2,700,000            
December 2011 Financing [Member] | Common Stock [Member] | Series A Warrants [Member]                  
Class of Warrant or Right [Line Items]                  
Exercise price of warrants | $ / shares   $ 1.40           $ 1.40  
Number of shares issued upon Series B warrants exercise         1,180,015 384,534 2,198,571    
April 2015 Financing [Member] | Common Stock [Member] | Series A Warrants [Member]                  
Class of Warrant or Right [Line Items]                  
Exercise price of warrants | $ / shares                 $ 0.6999999
July 2014 Financing [Member]                  
Class of Warrant or Right [Line Items]                  
Number of warrants expired 9,604,520