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Redeemable Convertible Preferred Stock - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Aug. 17, 2016
Mar. 31, 2016
Dec. 31, 2015
Temporary Equity [Line Items]                
Redeemable convertible preferred stock, shares issued   0   0       77,185,117
Proceeds from issuance of redeemable convertible preferred stock upon exercise of warrants       $ 22,508,000 $ 17,362,000      
Shares issued upon conversion of preferred stock           8,577,571    
Redeemable convertible preferred stock, shares outstanding   0   0       77,185,117
Redeemable convertible preferred stock, period accretion   $ 293,000 $ 36,000 $ 558,000 $ 36,000      
Series B Redeemable Convertible Preferred Stock [Member]                
Temporary Equity [Line Items]                
Redeemable convertible preferred stock, shares issued 1,999,998              
Proceeds from issuance of redeemable convertible preferred stock upon exercise of warrants $ 20,000              
Redeemable convertible preferred stock, shares outstanding             2,000,000