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Schedule of Accrued Liabilities (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Schedule of Accrued Liabilities [Line Items] |  |
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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