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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 |  |

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