Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Share-Based Compensation - Additional Information (Detail)

v3.21.1
Share-Based Compensation - Additional Information (Detail) - Two Thousand And Sixteen Share Plan [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation by share based payment arrangement number of shares authorized for issuance 12,513,999 12,513,999  
Common stock shares reserved for future issuance 2,066,574 3,795,989  
Share based compensation by share based payment arrangement contractual term 10 years 10 years  
Share based compensation by share based payment arrangement service based vesting term 4 years 4 years  
Share based compensation by share based payment arrangement options unrecognized compensation $ 9,220 $ 5,660 $ 5,110
Share based compensation by share based payment arrangement weighted average period of recognition 2 years 11 months 1 day 2 years 9 months 14 days 3 years 18 days
Share based compensation by share based payment arrangement weighted average grant date fair value per share $ 3.01 $ 1.58