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Employee Benefit - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Defined Benefit Plans [Abstract]      
Total charges for defined contribution pension plans $ 966 $ 1,160 $ 1,264
Amount of long service leave obligation $ 677 $ 580