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Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accrued Expenses    
Accrued royalties $ 9,464 $ 15,138
Accrued bonuses 3,289 4,286
Accrued payroll and related benefits 1,949 1,544
Accrued incentive compensation 1,354 1,806
Accrued audit and legal 716 480
Accrued sales and marketing 651 2,193
Accrued interest 429 274
Accrued inventory 222 3,745
Accrued other operating costs 2,540 1,085
Total accrued expenses $ 20,614 $ 30,551