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Taxation - Summary of Changes in Deferred Tax Asset and Liability Balances (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets, non-current portion:        
Net operating losses carried forward (note a) [1] $ 27,712 $ 20,479    
Impairment of long-term equity investment 4,061 1,760    
Allowance for advance to suppliers 346 351    
Impairment of property and equipment 14 32    
Impairment of other receivables 1,553 2,126    
Impairment of accounts receivable 1,140 1,094    
Impairment of inventories 549 29    
Valuation allowance (34,257) (20,181) $ (16,599) $ (9,851)
Total deferred tax assets, net [2] 1,118 5,690    
Deferred tax liabilities, non-current portion:        
Deferred credit arising from asset acquisition (1,179) $ (1,366)    
Net operating tax loss carryforwards $ 166,447      
[1] As of December 31, 2019, the Group had tax loss carryforwards of USD166,447,000 which can be carried forward to offset future taxable income and will expire during the period from 2020 to 2025.
[2] As at December 31, 2018 and 2019, the deferred tax assets and liabilities balances are expected to be recoverable as follows: