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Accrued Liabilities | 3 Months Ended
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Mar. 31, 2018
Accrued Liabilities | 9. Accrued Liabilities Accrued liabilities consist of the following (in thousands):
|  | March 31, 2018 |  |  | December 31, 2017 |
Employee compensation |  | $ | 5,246 |  |  | $ | 9,560 |
Taxes |  |  | 2,049 |  |  |  | 1,668 |
Royalty and license fees |  |  | 1,243 |  |  |  | 1,383 |
Accrued purchases |  |  | 521 |  |  |  | 1,191 |
Professional fees |  |  | 827 |  |  |  | 947 |
Unearned revenue |  |  | 1,547 |  |  |  | 960 |
Other accrued expenses |  |  | 2,688 |  |  |  | 2,220 |
Total |  | $ | 14,121 |  |  | $ | 17,929 |

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- Definition The entire disclosure for accounts payable and accrued liabilities at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a),20,24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration