Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 27, 2020	Mar. 29, 2019	Dec. 31, 2019	Dec. 20, 2019	Dec. 17, 2019	Sep. 26, 2016
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights						$ 4.76
Reduction to net revenues - amortization of the Warrant	$ 434	$ 25
Comcast Warrants Exercise in its Entirety [Member]
Class of Warrant or Right [Line Items]
Right to purchase shares vested					3,217,547
Comcast Warrants Exercise Shares Delivered [Member]
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right				804,387
Comcast Warrants Exercised Shares Remaining to be Issued [Member]
Class of Warrant or Right [Line Items]
Right to purchase shares vested			2,413,160
Maximum [Member] | Comcast Warrant Expires September 26, 2023 [Member]
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights						7,816,162
Revenue from Contract with Customer Benchmark [Member]
Class of Warrant or Right [Line Items]
Reduction to net revenues - amortization of the Warrant	$ 400	$ 25