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Stockholders' Equity - Preferred and Common Stock (Detail)
 1 Months Ended 10 Months Ended 12 Months Ended
Jan. 01, 2017
USD ($)
$ / shares
shares
Oct. 20, 2009
USD ($)
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Jan. 31, 2014
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Class of Stock [Line Items]                
Shares authorized             130,601,021  
Convertible Preferred Stock                
Convertible preferred shares issued         0 0   0
Aggregate amount of preferred stock issued | $           $ 23,601,955 $ 57,248,219  
Conversion of prior Bridge financing principal and accrued interest | $   $ 16,099,770            
Common stock, shares authorized         100,000,000 100,000,000   100,000,000
Common stock, par value | $ / shares         $ 0.001 $ 0.001   $ 0.001
Preferred stock, shares authorized         5,000,000 5,000,000   5,000,000
Preferred stock, par value | $ / shares         $ 0.001 $ 0.001   $ 0.001
Common Stock                
Number of shares sold     3,476,793          
Weighted average price per share issued | $ / shares     $ 6.10          
Aggregate net proceeds from stock sale | $     $ 19,700,000          
Series A-1 Convertible Preferred Stock                
Convertible Preferred Stock                
Convertible preferred shares issued   30,726,326            
Aggregate amount of preferred stock issued | $   $ 38,979,412            
Preferred stock, shares authorized             60,342,745  
Preferred stock, par value | $ / shares             $ 0.001  
Common Stock                
Reverse stock split           0.1    
Common Stock                
Convertible Preferred Stock                
Aggregate amount of preferred stock issued | $           $ 4,146 $ 8,050  
Common stock, shares authorized             70,258,276  
Common Stock                
Number of shares sold           4,145,584 8,050,000  
Initial Public Offering | Common Stock                
Convertible Preferred Stock                
Common stock, shares authorized               100,000,000
Aggregate number of common stock shares converted from convertible preferred stock       9,305,359        
Initial Public Offering | Preferred Stock [Member]                
Convertible Preferred Stock                
Preferred stock, shares authorized               5,000,000
At The Market Equity Offering | Subsequent Event                
Common Stock                
Number of shares sold 461,989              
Weighted average price per share issued | $ / shares $ 6.228              
Aggregate net proceeds from stock sale | $ $ 2,800,000              
At The Market Equity Offering | Common Stock                
Common Stock                
Number of shares sold         668,791      
Weighted average price per share issued | $ / shares         $ 6.336 $ 6.336    
Aggregate net proceeds from stock sale | $         $ 3,900,000