Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Summary of Grant Date Fair Value of Restricted Stock Unit Awards Vested (Detail)

v3.19.3
Stock-Based Compensation - Summary of Grant Date Fair Value of Restricted Stock Unit Awards Vested (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grant-date fair value $ 392 $ 40 $ 1,803 $ 1,791