Summary of Significant Accounting Policies - The revenues by geographic areas based on the billing location of the customers (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 05, 2026	Jun. 29, 2025	Jul. 05, 2026	Jun. 29, 2025
Disaggregation of Revenue [Line Items]
Total	$ 9,024	$ 7,468	$ 16,624	$ 12,566
Concentration Risk (in percentage)	100.00%	100.00%	100.00%	100.00%
South Korea \| Geographic Concentration Risk \| Revenue from Contract with Customer Benchmark
Disaggregation of Revenue [Line Items]
Concentration Risk (in percentage)	70.00%	69.00%	69.00%	60.00%
Switzerland \| Geographic Concentration Risk \| Revenue from Contract with Customer Benchmark
Disaggregation of Revenue [Line Items]
Concentration Risk (in percentage)	15.00%	12.00%	14.00%	18.00%
Other \| Geographic Concentration Risk \| Revenue from Contract with Customer Benchmark
Disaggregation of Revenue [Line Items]
Concentration Risk (in percentage)	15.00%	19.00%	17.00%	22.00%
Product \| South Korea \| Geographic Concentration Risk \| Revenue from Contract with Customer Benchmark
Disaggregation of Revenue [Line Items]
Total	$ 6,281	$ 5,128	$ 11,507	$ 7,539
Product \| Switzerland \| Geographic Concentration Risk \| Revenue from Contract with Customer Benchmark
Disaggregation of Revenue [Line Items]
Total	1,350	919	2,400	2,301
Product \| Other \| Geographic Concentration Risk \| Revenue from Contract with Customer Benchmark
Disaggregation of Revenue [Line Items]
Total	$ 1,393	$ 1,421	$ 2,717	$ 2,726

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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