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Fair Values of Financial Assets and Liabilities (Details) - Fair Value Measurements Recurring - USD ($) $ in Thousands | Sep. 28, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Cash equivalents | $ 2,109 | $ 2,665
Assets, fair value | 2,241 | 2,815
Liabilities |  |
Liabilities, fair value | 2,471 | 4,104
Prepaid Expenses and Other Current Assets |  |
Assets |  |
Foreign currency forward contracts | 132 | 150
Other Liabilities |  |
Liabilities |  |
Contingent consideration - Long-term | 2,438 | 1,304
Accrued Expenses And Other Current Liabilities |  |
Liabilities |  |
Foreign currency forward contracts | 33 |
Contingent consideration - Current |  | 2,800
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets |  |
Cash equivalents | 2,109 | 2,665
Assets, fair value | 2,109 | 2,665
Significant Other Observable Inputs (Level 2) |  |
Assets |  |
Assets, fair value | 132 | 150
Liabilities |  |
Liabilities, fair value | 33 |
Significant Other Observable Inputs (Level 2) | Prepaid Expenses and Other Current Assets |  |
Assets |  |
Foreign currency forward contracts | 132 | 150
Significant Other Observable Inputs (Level 2) | Accrued Expenses And Other Current Liabilities |  |
Liabilities |  |
Foreign currency forward contracts | 33 |
Significant Other Unobservable Inputs (Level 3) |  |
Liabilities |  |
Liabilities, fair value | 2,438 | 4,104
Significant Other Unobservable Inputs (Level 3) | Other Liabilities |  |
Liabilities |  |
Contingent consideration - Long-term | $ 2,438 | 1,304
Significant Other Unobservable Inputs (Level 3) | Accrued Expenses And Other Current Liabilities |  |
Liabilities |  |
Contingent consideration - Current |  | $ 2,800

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