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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, 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

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- Definition Uncertain tax positions. + References No definition available. + Details
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