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Taxation - Reconciliation of Total Tax (Benefits) Expenses (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Continuing operations      
Income tax (benefits)/expenses at PRC statutory rate (based on statutory tax rate applicable to enterprises in China) $ 246 $ (3,736) $ (11,886)
Effects of differences in tax rates in different jurisdictions applicable to entities of the Group outside of the PRC 2,571 787 788
Non-deductible expenses 47 101 228
Effect of Super Deduction (2,262) (733) (1,920)
Effect of tax holidays and tax concessions (4,100) (197) 3,856
Change in valuation allowance of deferred tax assets 3,507 4,704 13,180
Expiration of tax loss   84 400
Others (134) 139 30
Income tax (benefits)/expenses $ (125) $ 1,149 $ 4,676