Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Summary of Stock-Based Compensation Expense Related to Stock Option Awards (Detail)

v3.19.3.a.u2
Stock-Based Compensation - Summary of Stock-Based Compensation Expense Related to Stock Option Awards (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expenses $ 9,175 $ 4,385 $ 12,092
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expenses $ 6,035 $ 3,609 $ 9,291