Revenue - Schedule of Disaggregation of Revenue by Timing of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 30, 2019	Sep. 26, 2020	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Total revenue	$ 126,492	$ 62,935	$ 401,368	$ 185,338
Transferred at Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	122,015	58,663	387,556	172,562
Transferred over Time [Member]
Disaggregation Of Revenue [Line Items]
Total revenue	$ 4,477	$ 4,272	$ 13,812	$ 12,776