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Fair Value Measurements - Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 | Jul. 01, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Payment of contingent consideration | $ 0 | $ (1,000)
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | 2,554 |
Ending balance | 1,691 |
GVi | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities, Fair Value Adjustment | (1,019) |
Chiaro Technologies LLC [Member] | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Liabilities, Fair Value Adjustment | $ 156 |

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