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Summary of Significant Accounting Policies - Additional Information (Detail) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 26, 2020 USD ($) shares | Sep. 28, 2019 USD ($) shares | Sep. 26, 2020 USD ($) segment shares | Sep. 28, 2019 USD ($) shares | Dec. 28, 2019 USD ($) | Dec. 29, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash and cash equivalents | $ 669,056 | $ 513,360 | $ 669,056 | $ 513,360 | $ 567,687 |
Short-term investments | $ 50,000 |  | $ 50,000 |  | 120,000 |
Maturity of Time Deposits |  |  | 1 month |  |  |
Number of Sources of Product Revenue | segment |  |  | 4 |  |  |
Options to purchase of shares of common stock | shares | 100 | 400 | 300 | 300 |  |
Restricted cash | $ 3,384 | $ 152 | $ 3,384 | $ 152 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | $ 672,440 | $ 513,512 | $ 672,440 | $ 513,512 | $ 568,075 | $ 552,641
Intangible Assets |  |  | Intangible Assets Intangible assets consist primarily of patents, trademarks, software development costs, customer relationships and acquired technology. Costs related to patents and trademarks, which include legal and application fees, are capitalized and amortized over the estimated useful lives using the straight-line method. Patent and trademark amortization commences once final approval of the patent or trademark has been obtained. Patent costs are amortized over the lesser of 10 years or the patent’s remaining legal life, which assumes renewals, and trademark costs are amortized over 17 years, and their associated amortization cost is included in selling, general and administrative expense in the accompanying condensed consolidated statements of operations. For intangibles purchased in an asset acquisition or business combination, which mainly include patents, trademarks, customer relationships and acquired technologies, the useful life is determined in the same manner as noted above. The Company’s policy is to renew its patents and trademarks. Costs to renew patents and trademarks are capitalized and amortized over the remaining useful life of the intangible asset. The Company periodically evaluates the amortization period and carrying basis of patents and trademarks to determine whether any events or circumstances warrant a revised estimated useful life or reduction in value. Capitalized application costs are charged to operations when it is determined that the patent or trademark will not be obtained or is abandoned. |  |  |
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 |  |  |
Buildings |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 39 years |  |  |
Demonstration units |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 3 years |  |  |
Tooling |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 3 years |  |  |
Vehicles |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 5 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 | shares |  |  | 86 |  |  |
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 | shares |  |  | 2,700 | 2,700 |  |
Minimum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Warranty period for defects in material and workmanship |  |  | 3 months |  |  |
Minimum | Aircraft and components |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 4 years |  |  |
Minimum | 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 and equipment |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 5 years |  |  |
Maximum |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Warranty period for defects in material and workmanship |  |  | 48 months |  |  |
Maximum | Aircraft and components |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 20 years |  |  |
Maximum | Building improvements |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 15 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 and equipment |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 10 years |  |  |

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