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Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accrued Expenses    
Accrued royalties $ 15,463 $ 15,138
Accrued inventory 1,175 3,745
Accrued sales and marketing 690 2,193
Accrued payroll and related benefits 1,230 1,544
Accrued incentive compensation 1,566 1,806
Accrued bonuses 2,008 4,286
Accrued audit and legal 674 480
Accrued interest 382 274
Accrued other operating costs 1,329 1,085
Total accrued expenses $ 24,517 $ 30,551