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Summary of Significant Accounting Policies - Additional Information (Detail)
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2016
USD ($)
$ / shares
shares
Mar. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2011
$ / shares
shares
Mar. 31, 2016
USD ($)
Segment
$ / shares
shares
Dec. 31, 2014
shares
Dec. 31, 2013
shares
Dec. 31, 2012
shares
Dec. 31, 2011
$ / shares
shares
May. 06, 2016
shares
May. 05, 2016
shares
Dec. 31, 2015
USD ($)
shares
Apr. 30, 2015
$ / shares
Class of Warrant or Right [Line Items]                        
Number of segments | Segment       1                
Common stock, shares authorized [1]   200,000,000   200,000,000             200,000,000  
Maturity period for market accounts, money market funds and investments       90 days                
Term of warrant   5 years                    
Fair value of warrant liability | $   $ 6,159,671   $ 6,159,671             $ 770,964  
Proceeds from issuance of stock units | $       7,102,225                
Warrant expiration period   2 years                    
Other intangible assets, net | $   $ 42,322   42,322             45,816  
Value of patent | $       0                
Accumulated other comprehensive income | $   46,913   46,913             47,359  
2011 Series A Warrant [Member]                        
Class of Warrant or Right [Line Items]                        
Fair value of warrant liability | $   $ 512,000   $ 512,000                
Subsequent Events [Member]                        
Class of Warrant or Right [Line Items]                        
Common stock, shares authorized                 200,000,000 225,000,000    
Series A Warrants [Member]                        
Class of Warrant or Right [Line Items]                        
Number of securities callable by each warrant or right warrants   0.50   0.50                
Exercise price of warrants | $ / shares   $ 3.60   $ 3.60                
Number of additional warrants issued   166,473                    
Fair value of warrant liability | $   $ 1,761,000   $ 1,761,000                
Series A Warrants [Member] | Common Stock [Member]                        
Class of Warrant or Right [Line Items]                        
Exercise price of warrants | $ / shares                       $ 8.40
Series B Warrants [Member]                        
Class of Warrant or Right [Line Items]                        
Number of securities callable by each warrant or right warrants   0.75   0.75                
Exercise price of warrants | $ / shares   $ 5.04   $ 5.04                
Number of additional warrants issued   249,709                    
Fair value of warrant liability | $   $ 3,887,000   $ 3,887,000                
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 1       1        
Number of shares issued upon Series B warrants exercise             225,000          
December 2011 Financing [Member] | Series A Warrants [Member]                        
Class of Warrant or Right [Line Items]                        
Number of securities callable by each warrant or right warrants   1   1                
Term of warrant     5 years                  
Number of securities callable by warrants     666,667         666,667        
Exercise price of warrants | $ / shares   $ 3.60   $ 3.60                
Number of warrants exercised         98,335 32,045 183,215          
Number of additional warrants issued             225,000          
Fair value of warrant liability | $   $ 511,594   $ 511,594             $ 770,964  
December 2011 Financing [Member] | Series A Warrants [Member] | Common Stock [Member]                        
Class of Warrant or Right [Line Items]                        
Exercise price of warrants | $ / shares     $ 16.80         $ 16.80        
Number of shares issued upon Series B warrants exercise         98,335 32,045 183,215          
December 2011 Financing [Member] | Series B Warrants [Member]                        
Class of Warrant or Right [Line Items]                        
Term of warrant     90 days         90 days        
Number of securities callable by warrants     666,667         666,667        
Exercise price of warrants | $ / shares     $ 15.00         $ 15.00        
Number of warrants exercised             225,000          
Number of warrants expired       441,667     441,667          
April 2015 Financing [Member] | Series A Warrants [Member] | Common Stock [Member]                        
Class of Warrant or Right [Line Items]                        
Exercise price of warrants | $ / shares   $ 6.24   $ 6.24               $ 8.40
March 2016 Financing [Member] | Series A Warrants [Member]                        
Class of Warrant or Right [Line Items]                        
Exercise price of warrants | $ / shares   $ 3.60   $ 3.60                
Fair value of warrant liability | $   $ 1,760,937   $ 1,760,937                
March 2016 Financing [Member] | Series A Warrants [Member] | Common Stock [Member]                        
Class of Warrant or Right [Line Items]                        
Exercise price of warrants | $ / shares   $ 3.60   $ 3.60                
March 2016 Financing [Member] | Series B Warrants [Member]                        
Class of Warrant or Right [Line Items]                        
Exercise price of warrants | $ / shares   $ 5.04   $ 5.04                
Fair value of warrant liability | $   $ 3,887,140   $ 3,887,140                
Underwritten Public Offering [Member]                        
Class of Warrant or Right [Line Items]                        
Number of shares issued upon Series B 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   $ 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   416,672                
Number of shares issued upon Series B warrants exercise   333,338                    
Underwriting option exercise period   45 days                    
Over-Allotment-Option [Member] | Subsequent Events [Member]                        
Class of Warrant or Right [Line Items]                        
Number of shares issued upon Series B warrants exercise 41,667                      
Proceeds from issuance of stock units | $ $ 150,000                      
Number of stock units issued, price per share | $ / shares $ 3.60                      
[1] * Adjusted for the 1-for-12 reverse stock split as discussed in Note 1.