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Taxation - Reconciliation of Total Tax (Benefits)/ Expenses (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Continuing operations      
Income tax benefit at PRC statutory rate (based on statutory tax rate applicable to enterprises in China) $ (3,736) $ (11,886) $ (10,384)
Effects of differences in tax rates in different jurisdictions applicable to entities of the Group outside of the PRC 787 788 485
Non-deductible expenses 101 228 245
Effect of Super Deduction (733) (1,920) (881)
Effect of tax holidays and tax concessions (197) 3,856 3,776
Change in valuation allowance of deferred tax assets 4,704 13,180 6,720
Effect on deferred tax assets due to change in tax rates     (167)
Expiration of tax loss 84 400 562
Others 139 30 (445)
Income tax (benefits)/expenses $ 1,149 $ 4,676 $ (89)