Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 02, 2021 USD ($) Customer	Sep. 26, 2020 Customer	Oct. 02, 2021 USD ($) Customer	Sep. 26, 2020 USD ($) Customer	Jan. 02, 2021 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
Arrangement fee			$ 2.0
Arrangement expiration period			9 months
Fair value of distribution right			$ 14.8
Arrangement fee			3.4
Customer deposit			1.4
Deferred revenue recognized			0.8	$ 1.0
Non-current portion of deferred revenue pertains to exclusivity fee deferred revenue	$ 9.9		9.9
Current portion of deferred revenue pertains to exclusivity fee deferred revenue	$ 1.1		$ 1.1
Products warranty period			2 years
Revenue, Total | Customer Concentration Risk
Disclosure Summary Of Significant Accounting Policies [Line Items]
Number of customers | Customer		0		0
Revenue, Total | Topcon [Member] | Customer Concentration Risk
Disclosure Summary Of Significant Accounting Policies [Line Items]
Number of customers | Customer	1		1
Accounts Receivable | Customer Concentration Risk
Disclosure Summary Of Significant Accounting Policies [Line Items]
Percentage of accounts receivable accounted					13.00%
Accounts Receivable | Customer Concentration Risk | One Customer | Minimum
Disclosure Summary Of Significant Accounting Policies [Line Items]
Customer and supplier accounted percentage of total revenues, accounts receivable and purchases					10.00%
Accounts Receivable | Credit Concentration Risk
Disclosure Summary Of Significant Accounting Policies [Line Items]
Number of customers | Customer					1
Accounts Receivable | Topcon [Member] | Customer Concentration Risk
Disclosure Summary Of Significant Accounting Policies [Line Items]
Percentage of accounts receivable accounted	23.00%
Accounts Receivable | Topcon [Member] | Customer Concentration Risk | One Customer | Minimum
Disclosure Summary Of Significant Accounting Policies [Line Items]
Customer and supplier accounted percentage of total revenues, accounts receivable and purchases	10.00%
Accounts Receivable | Topcon [Member] | Credit Concentration Risk
Disclosure Summary Of Significant Accounting Policies [Line Items]
Number of customers | Customer	1
Revenue, Total | Customer Concentration Risk | No Customer | Minimum
Disclosure Summary Of Significant Accounting Policies [Line Items]
Customer and supplier accounted percentage of total revenues, accounts receivable and purchases		10.00%		10.00%
Revenue, Total | Topcon [Member] | Customer Concentration Risk
Disclosure Summary Of Significant Accounting Policies [Line Items]
Percentage of accounts receivable accounted	21.00%		15.00%
Revenue, Total | Topcon [Member] | Customer Concentration Risk | One Customer | Minimum
Disclosure Summary Of Significant Accounting Policies [Line Items]
Customer and supplier accounted percentage of total revenues, accounts receivable and purchases	10.00%		10.00%
Distribution Rights [Member]
Disclosure Summary Of Significant Accounting Policies [Line Items]
Revenue Recognized	$ 0.2		$ 0.3
Royalty Agreements
Disclosure Summary Of Significant Accounting Policies [Line Items]
Number of customers | Customer			2