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Income Tax - Reconciliation of Beginning and Ending Amounts of Uncertain Tax Position (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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

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