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Fair Value Measurements - Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 | Oct. 01, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Payment of contingent consideration | $ (1,000) | $ (1,926)
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Beginning balance | 3,557 |
Ending balance | 2,507 |
Manatee | 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 | (1,350) |
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 | 1,130 |
Payment of contingent consideration | (1,000) |
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 | $ 170 |

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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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