Quarterly report pursuant to Section 13 or 15(d)

Accounts Receivable, Net of Allowance for Doubtful Accounts (Detail)

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Accounts Receivable, Net of Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables $ 30,200 $ 35,500
Allowance for doubtful accounts (500) (500)
Accounts receivable, net of allowance for doubtful accounts $ 29,746 $ 34,972