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Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 26, 2020 Customer | Sep. 28, 2019 Customer | Sep. 26, 2020 USD ($) Customer | Sep. 28, 2019 USD ($) Customer | Dec. 28, 2019 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 |  |
Deferred revenue recognized | $ |  |  | $ 1.0 | $ 1.2 |
Products warranty period |  |  | 2 years |  |
Revenue, Total | Customer Concentration Risk |  |  |  |  |
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of customers | 0 | 0 | 0 | 0 |
Accounts Receivable | Customer Concentration Risk |  |  |  |  |
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Customer and supplier accounted percentage of total revenues, accounts receivable and purchases |  |  | 10.00% |  | 10.00%
Percentage of accounts receivable accounted |  |  |  |  | 11.00%
Accounts Receivable | Credit Concentration Risk |  |  |  |  |
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of customers |  |  |  |  | 1
Revenue, Total | Customer Concentration Risk |  |  |  |  |
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Customer and supplier accounted percentage of total revenues, accounts receivable and purchases | 10.00% | 10.00% | 10.00% | 10.00% |
Royalty Agreements |  |  |  |  |
Disclosure Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of customers |  |  | 2 |  |

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