Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Summary of Stock-Based Compensation Expenses Related to Performance Stock Units (Detail)

v3.20.2
Stock-Based Compensation - Summary of Stock-Based Compensation Expenses Related to Performance Stock Units (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 570 $ 2,705 $ 3,638 $ 6,565
Performance Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 114 $ 114 $ 334 $ 114