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Summary of Significant Accounting Policies - Additional Information (Detail) shares in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 03, 2021 shares | Jun. 27, 2020 shares | Jul. 03, 2021 segment shares | Jun. 27, 2020 shares
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of Sources of Product Revenue | segment |  |  | 4 |
Options to purchase of shares of common stock | 400 | 300 | 200 | 300
Patents |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 10 years |
Trademarks |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 17 years |
Demonstration units |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 3 years |
Restricted Stock Units (RSUs) |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 82 |
Restricted Stock Units (RSUs) | Chief Executive Officer |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  | 2,700 | 2,700
Minimum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Warranty period for defects in material and workmanship |  |  | 3 months |
Minimum | Building and building improvements |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 7 years |
Minimum | Computer equipment and software |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 2 years |
Minimum | Furniture and office equipment |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 2 years |
Minimum | Machinery, equipment and tooling |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 3 years |
Minimum | Transportation, vehicles and other |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 4 years |
Maximum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Warranty period for defects in material and workmanship |  |  | 48 months |
Maximum | Building and building improvements |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 39 years |
Maximum | Computer equipment and software |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 12 years |
Maximum | Furniture and office equipment |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 6 years |
Maximum | Machinery, equipment and tooling |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 10 years |
Maximum | Transportation, vehicles and other |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 20 years |

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