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Accounts receivable, net - Accounts receivable, net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Receivables [Abstract]    
Accounts receivable $ 21,542 $ 400
Less: Allowance for doubtful accounts (318) (105)
Total accounts receivable, net $ 21,224 $ 295