Property and Equipment, Net (Tables)

3 Months Ended

Mar. 31, 2022

Property Plant And Equipment [Abstract]

Property and Equipment, Net

Property and equipment, net, consisted of the following:

	Estimated	March 31,			December 31,
	Useful Life	2022			2021
Lab and test equipment	7 years	$	19,474		$	18,581
Vehicles	5 years		5,663			5,414
Equipment	3-7 years		35,814			35,148
Furniture and fixtures	7 years		2,870			2,844
Leasehold improvements	7 years		7,284			7,268
Aircraft	10 years		931			931
Building	39 years		2,975			2,975
			75,011			73,161
Land			725			725
Construction in progress			3,172			2,342
Less accumulated depreciation			(46,426	)		(44,707	)
Total property and equipment—    net		$	32,482		$	31,521