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Accrued Expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Accrued Liabilities [Line Items]    
Royalties $ 17,854 $ 13,805
Inventory liabilities 5,943 5,425
Salaries and employee benefits 4,064 3,243
Unearned revenue 3,924 779
Bonuses 1,914 1,500
Goods in transit 1,669 3,441
Interest expense 1,398 2,520
Professional fees 1,376 3,696
Sales commissions 663 816
Other 3,340 3,420
Accrued expenses $ 42,145 $ 38,645