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Accrued Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2017
Accrued Liabilities | Accrued liabilities consist of the following (in thousands):
|  | December 31, 2017 |  |  | December 31, 2016 |
Employee compensation |  | $ | 9,560 |  |  | $ | 5,586 |
Taxes |  |  | 1,668 |  |  |  | 1,692 |
Royalty and license fees |  |  | 1,383 |  |  |  | 248 |
Contingent consideration |  |  | — |  |  |  | 6,119 |
Accrued purchases |  |  | 1,191 |  |  |  | 382 |
Professional fees |  |  | 947 |  |  |  | 411 |
Unearned revenue |  |  | 960 |  |  |  | 408 |
Other accrued expenses |  |  | 2,220 |  |  |  | 1,168 |
Total |  | $ | 17,929 |  |  | $ | 16,014 |

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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
Period Type: | duration