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Accrued Expenses (Tables) | 12 Months Ended
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Dec. 31, 2017
Accrued Expenses | Accrued expenses consist of the following (in thousands):
|  | 2016 |  |  | 2017 |
Royalties |  | $ | 13,805 |  |  | $ | 17,854 |
Inventory liabilities |  |  | 5,425 |  |  |  | 5,943 |
Salaries and employee benefits |  |  | 3,243 |  |  |  | 4,064 |
Unearned revenue |  |  | 779 |  |  |  | 3,924 |
Bonuses |  |  | 1,500 |  |  |  | 1,914 |
Goods in transit |  |  | 3,441 |  |  |  | 1,669 |
Interest expense |  |  | 2,520 |  |  |  | 1,398 |
Professional fees |  |  | 3,696 |  |  |  | 1,376 |
Sales commissions |  |  | 816 |  |  |  | 663 |
Other |  |  | 3,420 |  |  |  | 3,340 |
|  | $ | 38,645 |  |  | $ | 42,145 |

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- Definition Tabular disclosure of the components of accrued liabilities. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
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