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Warrant Liability - Additional Information (Detail)
 1 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2011
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 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
Apr. 30, 2015
$ / shares
Class of Warrant or Right [Line Items]                  
Term of warrant 5 years                
Proceeds from issuance of stock units | $     $ 7,259,613 $ 24,942,963          
Warrant expiration period 2 years                
Dividend yield     0.00%            
Series B Warrants [Member]                  
Class of Warrant or Right [Line Items]                  
Number of securities callable by each warrant or right warrants 0.75                
Exercise price of warrants | $ / shares $ 5.04                
Number of additional warrants issued 249,709                
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 $ 3.60                
Number of additional warrants issued 166,473                
Proceeds from sale of stock | $         $ 1,652,000 $ 538,000 $ 3,078,000    
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    
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 B Warrant [Member]                  
Class of Warrant or Right [Line Items]                  
Warrant expiration period     2016-12            
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] | 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 B Warrant [Member]                  
Class of Warrant or Right [Line Items]                  
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    
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]                  
Dividend yield     0.00%            
March 2016 Financing [Member] | Series A Warrants [Member]                  
Class of Warrant or Right [Line Items]                  
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