Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 26, 2020 Customer	Sep. 28, 2019 Customer	Sep. 26, 2020 USD ($) Customer	Sep. 28, 2019 USD ($) Customer	Dec. 28, 2019 Customer
Disclosure Summary Of Significant Accounting Policies [Line Items]
Service contract warranty period			1 year
Service contract, period to determine nature of sale			60 days
Deferred revenue recognized | $			$ 1.0	$ 1.2
Products warranty period			2 years
Revenue, Total | Customer Concentration Risk
Disclosure Summary Of Significant Accounting Policies [Line Items]
Number of customers	0	0	0	0
Accounts Receivable | Customer Concentration Risk
Disclosure Summary Of Significant Accounting Policies [Line Items]
Customer and supplier accounted percentage of total revenues, accounts receivable and purchases			10.00%		10.00%
Percentage of accounts receivable accounted					11.00%
Accounts Receivable | Credit Concentration Risk
Disclosure Summary Of Significant Accounting Policies [Line Items]
Number of customers					1
Revenue, Total | Customer Concentration Risk
Disclosure Summary Of Significant Accounting Policies [Line Items]
Customer and supplier accounted percentage of total revenues, accounts receivable and purchases	10.00%	10.00%	10.00%	10.00%
Royalty Agreements
Disclosure Summary Of Significant Accounting Policies [Line Items]
Number of customers			2