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Taxation - Schedule of Movement of Valuation Allowance (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Beginning balance $ (9,851) $ (4,559) $ (291)
Additions (6,748) (5,292) (4,268)
Write-off 0 0 0
Ending balance $ (16,599) $ (9,851) $ (4,559)