Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

v3.19.3
Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Mar. 08, 2019
Feb. 01, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 11, 2019
Dec. 31, 2018
Equity [Abstract]            
Common stock, shares issued 8,000,000 13,340,000 68,701,043   1,200,000 59,456,493
Common stock offering price $ 12.50 $ 10.80        
Proceeds from issuance of common stock, net of issuance costs $ 107,700 $ 135,500 $ 107,746 $ 135,520