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Accounts receivable, net - Accounts Receivable, Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Receivables [Abstract]      
Accounts receivable $ 31,748 $ 21,542  
Less: Allowance for doubtful accounts (790) (318) $ (105)
Total accounts receivable, net $ 30,958 $ 21,224