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Warrants (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2018 USD ($) Measurement_Input shares | Sep. 28, 2018 USD ($) | Sep. 29, 2017 USD ($) | Sep. 28, 2018 USD ($) | Sep. 29, 2017 USD ($) | Sep. 26, 2016 USD ($) $ / shares shares
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  |  | 7,816,162
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  | $ 4.76
Warrants and Rights Outstanding | $ |  |  |  |  |  | $ 1,600
Fair Value Adjustment of Warrants | $ |  | $ 790 |  | $ 1,185 |  |
Comcast Product Supply Agreement [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Class of Warrant or Right, Outstanding |  |  |  |  |  | 781,617
Comcast Milestones Achievement [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Class of Warrant or Right, Unissued |  |  |  |  |  | 1,954,042
Comcast Milestone Acceptance Of Completion Of Field Trials [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Class of Warrant or Right, Outstanding | 1,172,425 |  |  |  |  |
Class of Warrant or Right, Unissued |  |  |  |  |  | 1,172,425
Fair Value of Warrants On Vesting Date Using Black-Scholes Option Model | $ | $ 2,300 |  |  |  |  |
Comcast Specified Tranches [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Class of Warrant or Right, Unissued |  |  |  |  |  | 781,617
Comcast Exceeding Specified Cumulative Purchase Volume [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Class of Warrant or Right, Unissued |  |  |  |  |  | 1,172,425
Sales Revenue, Goods, Net [Member] | Comcast Product Supply Agreement [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Fair Value Adjustment of Warrants | $ |  | $ 800 | $ (400) | $ 1,200 | $ 38 |
Measurement Input, Expected Term [Member] | Comcast Product Supply Agreement [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Fair Value Assumptions, Expected Term (Deprecated 2018-01-31) | 5 years 2 months 12 days |  |  |  |  |
Measurement Input, Risk Free Interest Rate [Member] | Comcast Product Supply Agreement [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Fair Value Assumptions, Expected Volatility Rate (Deprecated 2018-01-31) | Measurement_Input | 0.45 |  |  |  |  |
Measurement Input, Price Volatility [Member] | Comcast Product Supply Agreement [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Fair Value Assumptions, Expected Volatility Rate (Deprecated 2018-01-31) | Measurement_Input | 0.029 |  |  |  |  |
Measurement Input, Expected Dividend Rate [Member] | Comcast Product Supply Agreement [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Fair Value Assumptions, Expected Volatility Rate (Deprecated 2018-01-31) | Measurement_Input | 0.000 |  |  |  |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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