Segment Reporting and Geographic Information - Schedule of Revenue from External Customers by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 30, 2019	Sep. 26, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 126,492	$ 62,935	$ 401,368	$ 185,338
Sales [Member] | Product [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	100.00%	100.00%	100.00%	100.00%
Systems and Software [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 97,774	$ 52,786	$ 321,062	$ 154,207
Systems and Software [Member] | Sales [Member] | Product [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	77.00%	84.00%	80.00%	83.00%
Parts Revenue [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 18,815	$ 7,142	$ 48,719	$ 22,292
Parts Revenue [Member] | Sales [Member] | Product [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	15.00%	11.00%	12.00%	12.00%
Service Revenue [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 9,903	$ 3,007	$ 31,587	$ 8,839
Service Revenue [Member] | Sales [Member] | Product [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	8.00%	5.00%	8.00%	5.00%