Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details

Segment Reporting and Geographic Information - Schedule of Revenue from External Customers by Products and Services (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2021	Mar. 27, 2021	Mar. 28, 2020	Mar. 28, 2020
Segment Reporting Information [Line Items]
Total revenue	$ 169,279	$ 169,279	$ 139,928	$ 139,928
Sales [Member] \| Product [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage		100.00%		100.00%
Systems and Software [Member]
Segment Reporting Information [Line Items]
Total revenue		$ 141,509		$ 114,330
Systems and Software [Member] \| Sales [Member] \| Product [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage		84.00%		82.00%
Parts Revenue [Member]
Segment Reporting Information [Line Items]
Total revenue		$ 17,418		$ 13,575
Parts Revenue [Member] \| Sales [Member] \| Product [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage		10.00%		10.00%
Service Revenue [Member]
Segment Reporting Information [Line Items]
Total revenue		$ 10,352		$ 12,023
Service Revenue [Member] \| Sales [Member] \| Product [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage		6.00%		8.00%