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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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