Annual report pursuant to Section 13 and 15(d)

Components of Accounts Receivable, Net of Allowance (Detail)

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Components of Accounts Receivable, Net of Allowance (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Components of accounts receivable, net of allowances    
Trade $ 10,047 $ 9,699
Royalties 71 62
Other 6 23
Total receivables, net $ 10,124 $ 9,784