Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2021

Property Plant And Equipment [Abstract]

Property and Equipment, Net

Property and equipment, net, as of December 31, consisted of the following:

	Estimated Useful Life	2021			2020
Lab and test equipment	7 years	$	18,581		$	18,631
Vehicles	5 years		5,414			13,320
Equipment	3-7 years		35,148			32,177
Furniture and fixtures	7 years		2,844			2,938
Leasehold improvements	7 years		7,268			6,767
Aircraft	10 years		931			834
Building	39 years		2,975			2,975
			73,161			77,642
Land			725			725
Construction in progress			2,342			219
Less accumulated depreciation			(44,707	)		(44,187	)
Total property and equipment—net		$	31,521		$	34,399