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Summary of Significant Accounting Policies - Additional Information (Detail) shares in Thousands, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 28, 2020 USD ($) segment shares | Mar. 30, 2019 shares | Dec. 28, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Short-term investments | $ | $ 50,000 |  | $ 120,000
Maturity of Time Deposits | 7 months |  |
Number of Sources of Product Revenue | segment | 4 |  |
Options to purchase of shares of common stock | 400 | 300 |
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 | 72 |  |
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 | 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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