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Warrant Liability - Additional Information (Detail)
 1 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2016
$ / shares
shares
Mar. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2011
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Dec. 31, 2012
USD ($)
shares
Dec. 31, 2011
USD ($)
$ / shares
$ / Stock_Unit
shares
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Apr. 30, 2015
$ / shares
Class of Warrant or Right [Line Items]                        
Fair value of warrant liability | $       $ 651,902           $ 770,964 $ 770,964  
Proceeds from issuance of stock units | $       $ 7,259,613 $ 24,942,963              
Dividend yield       0.00%                
Series B Warrants [Member]                        
Class of Warrant or Right [Line Items]                        
Term of warrant   5 years                    
Number of securities callable by each warrant or right warrants   0.75                    
Exercise price of warrants | $ / shares $ 0.30 $ 5.04                    
Number of additional warrants issued   249,709                    
Number of warrants outstanding 1,916,407                      
Fair value of warrant liability | $       $ 482,000                
Warrant expiration period   1 year                    
Number of warrants surrendered 1,546,360                      
Series A Warrants [Member]                        
Class of Warrant or Right [Line Items]                        
Number of securities callable by each warrant or right warrants   0.50                    
Exercise price of warrants | $ / shares $ 0.30 $ 3.60                    
Number of warrants exercised 1,187,190                      
Number of additional warrants issued   166,473                    
Proceeds from sale of stock | $           $ 1,652,000 $ 538,000 $ 3,078,000        
Number of warrants outstanding 1,277,609                      
Fair value of warrant liability | $       115,000                
Warrant expiration period   2 years                    
2011 Series A Warrant [Member]                        
Class of Warrant or Right [Line Items]                        
Exercise price of warrants | $ / shares $ 0.30                      
Number of warrants exercised 531,814                      
Number of shares issued upon warrants exercise 531,814                      
Number of warrants outstanding 578,081                      
Fair value of warrant liability | $       $ 55,000                
2016 Series A Warrants [Member]                        
Class of Warrant or Right [Line Items]                        
Exercise price of warrants | $ / shares $ 0.30                      
Number of warrants exercised 1,187,190                      
Number of shares issued upon warrants exercise 1,187,190                      
Reduced exercise price of Series A Warrants in exchange for surrender of Series B Warrants | $ / shares $ 0.30                      
Number of warrants outstanding 1,277,609                      
2016 Series B Warrants [Member]                        
Class of Warrant or Right [Line Items]                        
Exercise price of warrants | $ / shares $ 0.30                      
Number of warrants outstanding 1,916,407                      
Number of warrants surrendered 1,546,360                      
Common Stock [Member] | Series A Warrants [Member]                        
Class of Warrant or Right [Line Items]                        
Exercise price of warrants | $ / shares                       $ 8.40
December 2011 Financing [Member]                        
Class of Warrant or Right [Line Items]                        
Proceeds from issuance of common stock and warrants | $                 $ 10,000,000      
Price per unit | $ / shares                 $ 15.00      
Number of Series A warrants in each unit issued in public offering | $ / Stock_Unit                 1      
December 2011 Financing [Member] | Series B Warrants [Member]                        
Class of Warrant or Right [Line Items]                        
Number of securities callable by warrants     666,667           666,667      
Term of warrant     90 days           90 days      
Warrant expiration date       May 02, 2012                
Exercise price of warrants | $ / shares     $ 15.00           $ 15.00      
Number of warrants exercised               225,000        
Number of warrants expired       441,667       441,667        
December 2011 Financing [Member] | Series A Warrants [Member]                        
Class of Warrant or Right [Line Items]                        
Number of securities callable by warrants     666,667           666,667      
Term of warrant     5 years                  
Number of securities callable by each warrant or right warrants       1                
Number of warrants exercised           98,335 32,045 183,215        
Number of additional warrants issued               225,000        
Fair value of warrant liability | $       $ 54,945           $ 770,964    
Dividend yield       0.00%                
December 2011 Financing [Member] | Capital Units [Member]                        
Class of Warrant or Right [Line Items]                        
Number of securities callable by warrants     666,667           666,667      
December 2011 Financing [Member] | Capital Units [Member] | Series A Warrants [Member]                        
Class of Warrant or Right [Line Items]                        
Number of securities callable by each warrant or right warrants     1           1      
December 2011 Financing [Member] | Capital Units [Member] | Series B Warrant [Member]                        
Class of Warrant or Right [Line Items]                        
Warrant expiration period       2016-12                
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         1      
Number of shares issued upon warrants exercise               225,000        
December 2011 Financing [Member] | Common Stock [Member] | Series A Warrants [Member]                        
Class of Warrant or Right [Line Items]                        
Exercise price of warrants | $ / shares     $ 16.80           $ 16.80      
Number of shares issued upon warrants exercise           98,335 32,045 183,215        
December 2011 Financing [Member] | Common Stock [Member] | Series B Warrant [Member]                        
Class of Warrant or Right [Line Items]                        
Number of shares issued upon warrants exercise               225,000        
April 2015 Financing [Member] | Common Stock [Member] | Series A Warrants [Member]                        
Class of Warrant or Right [Line Items]                        
Exercise price of warrants | $ / shares   $ 6.24   $ 6.24               $ 8.40
March 2016 Financing [Member] | Series B Warrants [Member]                        
Class of Warrant or Right [Line Items]                        
Fair value of warrant liability | $       $ 482,039                
Dividend yield       0.00%                
March 2016 Financing [Member] | Series A Warrants [Member]                        
Class of Warrant or Right [Line Items]                        
Fair value of warrant liability | $       $ 114,918                
Dividend yield       0.00%                
March 2016 Financing [Member] | Common Stock [Member] | Series A Warrants [Member]                        
Class of Warrant or Right [Line Items]                        
Exercise price of warrants | $ / shares   $ 3.60   $ 3.60                
Underwritten Public Offering [Member]                        
Class of Warrant or Right [Line Items]                        
Number of shares issued upon warrants exercise   2,222,250                    
Proceeds from issuance of stock units | $   $ 8,000,000                    
Number of stock units issued, price per share | $ / shares   $ 3.60                    
Over-Allotment-Option [Member]                        
Class of Warrant or Right [Line Items]                        
Number of securities callable by each warrant or right warrants   416,672                    
Number of shares issued upon warrants exercise   333,338                    
Underwriting option exercise period   45 days