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Accounts receivable, net - Schedule of Accounts Receivable (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets held for sale        
Accounts receivable $ 40,663 $ 14,655    
Less: Allowance for doubtful accounts (31) (119) $ (126) $ (131)
Accounts receivable, net $ 40,632 $ 14,536