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Disaggregation of Sales, Geographic Sales and Product Sales - Additional Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 26, 2025 USD ($)	Sep. 27, 2024 USD ($)	Sep. 26, 2025 USD ($) Segment	Sep. 27, 2024 USD ($)	Dec. 27, 2024	Sep. 27, 2025 Country
Geographic and Product Data [Line Items]
Number of countries in which Company operates | Country						75
Net sales	$ 94,732,000	$ 88,590,000	$ 181,641,000	$ 264,951,000
Number of operating segments | Segment			1
Consignment Sales [Member]
Geographic and Product Data [Line Items]
Net sales	31,737,000	$ 4,887,000	$ 43,270,000	$ 14,709,000
China [Member] | Consignment Sales [Member]
Geographic and Product Data [Line Items]
Net sales	$ 27,969,000		$ 30,754,000
Sales Revenue, Net | Geographic Concentration Risk [Member] | Other than China and Japan [Member] | Maximum
Geographic and Product Data [Line Items]
Concentration risk, aggregate of percentage			10.00%		10.00%
Sales Revenue, Net | Geographic Concentration Risk [Member] | China [Member]
Geographic and Product Data [Line Items]
Concentration risk, aggregate of percentage	59.00%	59.00%	38.00%		58.00%
Sales Revenue, Net | Geographic Concentration Risk [Member] | Korea [Member]
Geographic and Product Data [Line Items]
Concentration risk, aggregate of percentage			33.00%	58.00%
Sales Revenue, Net | Product Concentration Risk [Member] | Ophthalmic Surgical Product [Member]
Geographic and Product Data [Line Items]
Concentration risk, aggregate of percentage			100.00%

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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