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Additional Financial Statement Information (Other Accrued Expenses) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Customer advance payments | $ 5,328 | $ 3,229
Accrued restructuring | 159 | 254
Goods received, not yet invoiced | 1,819 | 4,060
Accrued taxes, other than income taxes | 2,293 | 1,680
Accrued commissions | 2,203 | 1,694
Accrued professional fees | 1,775 | 1,731
Other | 3,454 | 3,304
Accrued liabilities, current | $ 17,031 | $ 15,952

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