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Common Stock - Additional Information (Detail)
 9 Months Ended 12 Months Ended
Nov. 09, 2016
shares
Sep. 30, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2011
USD ($)
shares
Dec. 31, 2014
shares
Class Of Stock [Line Items]          
Common stock shares pledged under guarantee   5,896,000 5,896,000    
Common stock, shares authorized   33,000,000 33,000,000   33,000,000
Common stock, shares, issued   22,229,570 22,139,480   22,039,600
Common stock, voting right     The holders of the common stock are entitled to one vote per share.    
Subsequent Event          
Class Of Stock [Line Items]          
Common stock split ratio 2,200        
Common stock, shares authorized 350,000,000        
Preferred stock, undesignated shares authorized 10,000,000        
Series A Preferred Stock          
Class Of Stock [Line Items]          
Common stock, shares issued       14,300,000  
Common stock, value issued | $       $ 0  
Convertible preferred stock value issued upon conversion | $   $ 1,179,000 $ 1,179,000    
Convertible preferred stock, shares issued upon conversion   14,300,000 14,300,000    
Convertible preferred stock, settlement terms   the amount allocated to the Series A Investor’s common shares was accreted to the face value of the Series A Preferred Stock with a corresponding charge to interest expense over the 5-year term of the Series A Preferred Stock.      
Preferred shares corresponding charge interest expense period   5 years 5 years