Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

v3.10.0.1
Stockholders' Equity - Additional Information (Detail) - $ / shares
Sep. 30, 2018
Dec. 31, 2017
Equity [Abstract]    
Common stock, shares issued 38,651,360 38,374,011
Common stock, shares outstanding 38,651,360 38,374,011
Common stock share, par value $ 0.0001 $ 0.0001
Preferred stock, shares authorized 25,000,000 25,000,000
Preferred stock, par value $ 0.0001 $ 0.0001
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0