Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

v3.10.0.1
Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
Feb. 01, 2018
Jun. 30, 2018
Dec. 31, 2017
Equity [Abstract]      
Common stock, shares issued 13,340,000 58,959,936 44,408,796
Common stock offering price $ 10.80    
Net proceeds from public offering $ 135.5