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. 27, 2020	Jun. 30, 2019	Jun. 27, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Total revenue	$ 134,948	$ 61,511	$ 274,876	$ 122,403
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	$ 108,247	$ 51,612	$ 222,577	$ 101,421
Systems and Software [Member] | Sales [Member] | Product [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	80.00%	84.00%	81.00%	83.00%
Parts Revenue [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 16,329	$ 7,073	$ 29,904	$ 15,150
Parts Revenue [Member] | Sales [Member] | Product [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	12.00%	11.00%	11.00%	12.00%
Service Revenue [Member]
Segment Reporting Information [Line Items]
Total revenue	$ 10,372	$ 2,826	$ 22,395	$ 5,832
Service Revenue [Member] | Sales [Member] | Product [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	8.00%	5.00%	8.00%	5.00%