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Change in Allowances (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Allowances for doubtful accounts      
Balance, beginning of year $ 775 $ 1,167 $ 1,275
Reversals charged to expense, net (12) (392) (108)
Write-offs (40)    
Balance, end of year 723 775 1,167
Allowances for sales returns and discounts      
Balance, beginning of year 1,555 1,427 1,059
Additions charged to expense, net 3,285 1,753 1,600
Actual sales return and discount (3,216) (1,625) (1,232)
Balance, end of year $ 1,624 $ 1,555 $ 1,427