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Change in Allowances (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowances for doubtful accounts      
Balance, beginning of year $ 1,167 $ 1,275 $ 1,634
Reversals charged to expense, net (392) (108) (359)
Write-offs 0 0 0
Balance, end of year 775 1,167 1,275
Allowances for sales returns and discounts      
Balance, beginning of year 1,427 1,059 1,919
Additions charged to expense, net 1,753 1,600 1,320
Actual sales return and discount (1,625) (1,232) (2,180)
Balance, end of year $ 1,555 $ 1,427 $ 1,059