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Income Tax - Reconciliation of Beginning and Ending Amounts of Uncertain Tax Position (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Change In Uncertain Tax Positions [Abstract]      
Beginning balance $ 451 $ 674 $ 706
Additions based on tax positions related to the current year   0  
Decrease due to lapses in statute of limitations (144) (215)  
Exchange difference 32 (8) (32)
Ending balance $ 339 $ 451 $ 674