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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)

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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