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Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 29, 2018 | Jun. 30, 2017 | Jun. 29, 2018 | Jun. 30, 2017 | Dec. 31, 2018 | Sep. 26, 2016
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 |  |  |  |  |  | $ 4.76
Fair Value Adjustment of Warrants | $ 284 |  | $ 395 |  |  |
Comcast Product Supply Agreement [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Class of Warrant or Right, Outstanding |  |  |  |  |  | 781,617
Fair Value Assumptions, Expected Dividend Rate |  |  | 0.00% |  |  |
Comcast Milestones Achievement [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Class of Warrant or Right, Unissued |  |  |  |  |  | 1,954,042
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 | 300 | $ 0 | $ 400 | $ 400 |  |
Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Prepaid Warrants Incentive | $ 600 |  | $ 600 |  |  |
Scenario, Forecast [Member] | Prepaid Expenses and Other Current Assets [Member] |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Prepaid Warrants Incentive |  |  |  |  | $ 1,000 |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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- Definition Number of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The number of warrants or rights which entitle the entity to receive future services in exchange for the unvested, forfeitable warrants or rights. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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