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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Change In Tax Positions [Abstract]      
Beginning balance $ 674 $ 706 $ 828
Additions based on tax positions related to the current year 0    
Decrease due to lapses in statute of limitations (215)   (175)
Exchange difference (8) (32) 53
Ending balance $ 451 $ 674 $ 706