Segment Reporting and Geographic Information - Schedule of Revenue from External Customers by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Segment Reporting Information [Line Items]
Total revenue	$ 193,387	$ 134,948	$ 362,666	$ 274,876
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	$ 162,898	$ 108,247	$ 304,407	$ 222,577
Systems and Software [Member] | Sales [Member] | Product [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	84.00%	80.00%	84.00%	81.00%
Parts Revenue [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 18,697	$ 16,329	$ 36,115	$ 29,904
Parts Revenue [Member] | Sales [Member] | Product [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	10.00%	12.00%	10.00%	11.00%
Service Revenue [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 11,792	$ 10,372	$ 22,144	$ 22,395
Service Revenue [Member] | Sales [Member] | Product [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	6.00%	8.00%	6.00%	8.00%