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Taxation - Reconciliation of Total Tax (Benefit) Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Continuing operations      
Income tax benefit at PRC statutory rate (based on statutory tax rate applicable to enterprises in China) $ (11,886) $ (10,384) $ (11,617)
Effects of differences in tax rates in different jurisdictions applicable to entities of the Group outside of the PRC 788 485 1,341
Non-deductible expenses 228 245 32
Effect of Super Deduction (1,920) (881) (546)
Effect of tax holidays and tax concessions 3,856 3,776 4,102
Change in valuation allowance of deferred tax assets 13,180 6,720 6,748
Effect on deferred tax assets due to change in tax rates   (167)  
Outside basis difference arising from VIE and its subsidiaries in the PRC     (652)
Expiration of tax loss 400 562  
Others 30 (445) (1,660)
Income tax benefit $ 4,676 $ (89) $ (2,252)