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Fair Value Measurements - Quantitative Information about the Inputs and Valuation Methodologies Used for Fair Value Measurements (Details) - Fair Value Measurements Recurring - Earn Out Liability $ in Thousands | Sep. 29, 2018 USD ($) | Dec. 30, 2017 USD ($)
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Quantitative information about the inputs and valuation methodologies used for fair value measurements |  |
Liabilities, Fair Value Measurements | $ 364 | $ 572
Level 3 |  |
Quantitative information about the inputs and valuation methodologies used for fair value measurements |  |
Liabilities, Fair Value Measurements | $ 364 | $ 572
Valuation Technique, Earn-out liability | us-gaap:ValuationTechniqueDiscountedCashFlowMember | us-gaap:ValuationTechniqueDiscountedCashFlowMember
Level 3 | Discounted Cash Flow | Weighted Average |  |
Quantitative information about the inputs and valuation methodologies used for fair value measurements |  |
Weighted Average, Projected royalties | $ 1,314 | $ 1,622
Discount Rate | Level 3 | Weighted Average |  |
Quantitative information about the inputs and valuation methodologies used for fair value measurements |  |
Weighted Average, Discount rate | 10.35 | 10.90
Discount Rate | Level 3 | Minimum |  |
Quantitative information about the inputs and valuation methodologies used for fair value measurements |  |
Weighted Average, Discount rate | 10.20 | 10.90
Discount Rate | Level 3 | Maximum |  |
Quantitative information about the inputs and valuation methodologies used for fair value measurements |  |
Weighted Average, Discount rate | 27.00 | 27.00

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- Definition Value of input used to measure derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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