Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 02, 2022 USD ($) Customer	Jul. 03, 2021 Customer	Jul. 02, 2022 USD ($) Customer	Jul. 03, 2021 USD ($) Customer	Jan. 01, 2022 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			$ 200
Fair value of distribution right			14,800
Amortization costs	$ 21		21
Deferred revenue recognized			700	$ 700
Non-current portion of deferred revenue pertains to exclusivity fee deferred revenue	11,900		11,900
Current portion of deferred revenue pertains to exclusivity fee deferred revenue	1,500		$ 1,500
Products warranty period			2 years
Prepaid Expenses and Other Current Assets and Other Long Term Assets
Disclosure Summary Of Significant Accounting Policies [Line Items]
Deferred costs, incurred	$ 600		$ 600
Revenue, Total | Topcon [Member] | Customer Concentration Risk
Disclosure Summary Of Significant Accounting Policies [Line Items]
Number of customers | Customer	1	1	1	1
Accounts Receivable | Topcon [Member] | Customer Concentration Risk
Disclosure Summary Of Significant Accounting Policies [Line Items]
Number of customers | Customer			1
Percentage of accounts receivable accounted			26.00%
Accounts Receivable | Topcon [Member] | Customer Concentration Risk | One Customer
Disclosure Summary Of Significant Accounting Policies [Line Items]
Percentage of accounts receivable accounted					31.00%
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%		10.00%
Accounts Receivable | Topcon [Member] | Customer Concentration Risk | Customer Two
Disclosure Summary Of Significant Accounting Policies [Line Items]
Percentage of accounts receivable accounted					11.00%
Accounts Receivable | Topcon [Member] | Credit Concentration Risk
Disclosure Summary Of Significant Accounting Policies [Line Items]
Number of customers | Customer					2
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	26.00%	15.00%	28.00%	12.00%
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	$ 300		$ 600
Royalty Agreements
Disclosure Summary Of Significant Accounting Policies [Line Items]
Number of customers | Customer			4