Common Stock - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Oct. 09, 2014
Sep. 22, 2014
Sep. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Class of Stock [Line Items]          
Reverse stock split conversion description       The Company effected a 1-for-10.47 reverse stock split of its issued and outstanding shares of common stock.  
Proceeds from initial public offering, net of underwriting discounts and commissions         $ 97,929
Number of common shares issued on conversion of redeemable convertible preferred stock   14,860,173 14,860,173    
Option to Purchase Additional Shares of Common Stock Granted to the Underwriters in Connection with the IPO [Member]          
Class of Stock [Line Items]          
Common Stock, shares issued and sold 540,000        
Common stock, public offering price per share $ 15.00        
Proceeds from initial public offering, net of underwriting discounts and commissions $ 7,533        
Common Stock [Member]          
Class of Stock [Line Items]          
Number of common shares issued on conversion of redeemable convertible preferred stock         14,860,173
Common Stock [Member] | IPO [Member]          
Class of Stock [Line Items]          
Common Stock, shares issued and sold   6,480,000     7,020,000
Common stock, public offering price per share   $ 15.00      
Proceeds from initial public offering, net of underwriting discounts and commissions   $ 87,062