Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 30, 2023 USD ($) Customer	Dec. 31, 2022 USD ($) Customer	Jan. 01, 2023 USD ($)	Jan. 02, 2022 USD ($)
Disclosure Summary Of Significant Accounting Policies [Line Items]
Receivables	$ 146,000	$ 390,000	$ 9,800,000	$ 9,700,000
Provision for sales returns	0	0
Gross value of demos and loaners	2,300,000	1,900,000
Accumulated amortization on inventory demos and loaners	$ 1,900,000	1,700,000
Estimated useful life of demos and loaners	4 years
Estimated useful lives of the assets	3 years
Impairments expenses	$ 0	0
Capitalized implementation costs	$ 1,100,000
Capitalized implementation costs amortization period	5 years
Amortization expense	$ 200,000	0
Accumulated deficit	(79,042,000)	(69,716,000)
Amortization cost	$ 83,000	62,000
Service contract warranty period	1 year
Service contract, period to determine nature of sale	60 days
Arrangement fee	$ 200,000
Fair value of distribution right	14,800,000
Deferred revenue recognized	$ 2,500,000	2,300,000
Products warranty period	2 years
Advertising and promotion costs	$ 200,000	400,000
Accrued interest and penalty incurred	$ 0	0
ASU 2019-12
Disclosure Summary Of Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2022
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect	true
Adoption of ASU 2016-13
Disclosure Summary Of Significant Accounting Policies [Line Items]
Accumulated deficit			$ 200,000
Revenue, Total
Disclosure Summary Of Significant Accounting Policies [Line Items]
Impairments expenses	$ 0	0
Amortization cost	$ 105,000	$ 36,000
Revenue, Total | Minimum
Disclosure Summary Of Significant Accounting Policies [Line Items]
Amortization period	2 years
Revenue, Total | Maximum [Member]
Disclosure Summary Of Significant Accounting Policies [Line Items]
Amortization period	3 years
Revenue, Total | Customer Concentration Risk | Topcon [Member]
Disclosure Summary Of Significant Accounting Policies [Line Items]
Number of customers | Customer	1	1
Receivables | Credit Concentration Risk | Topcon [Member]
Disclosure Summary Of Significant Accounting Policies [Line Items]
Number of customers | Customer	1	1
Percentage of accounts receivable accounted	30.00%	37.00%
Receivables | Credit Concentration Risk | One Customer | Topcon [Member] | 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 | Customer Concentration Risk | Topcon [Member]
Disclosure Summary Of Significant Accounting Policies [Line Items]
Percentage of accounts receivable accounted	30.00%	28.00%
Revenue, Total | Customer Concentration Risk | One Customer | Topcon [Member] | 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	$ 1,500,000	$ 1,300,000
Intellectual Property [Member]
Disclosure Summary Of Significant Accounting Policies [Line Items]
Number of customers | Customer	3
Royalty Agreements
Disclosure Summary Of Significant Accounting Policies [Line Items]
Number of customers | Customer	4
Shipping and Handling
Disclosure Summary Of Significant Accounting Policies [Line Items]
Shipping and handling costs	$ 200,000	300,000
Prepaid Expenses and Other Current Assets and Other Long Term Assets
Disclosure Summary Of Significant Accounting Policies [Line Items]
Deferred costs incurred	700,000	800,000
Prepaid Expenses and Other Current Assets and Other Long Term Assets | Revenue, Total
Disclosure Summary Of Significant Accounting Policies [Line Items]
Deferred costs incurred	$ 200,000	$ 200,000