Property and Equipment, Net (Tables)

6 Months Ended

Jun. 30, 2021

Property Plant And Equipment [Abstract]

Property and Equipment, Net

Property and equipment, net, consisted of the following:

	Estimated	June 30,			December 31,
	Useful Life	2021			2020
Lab and test equipment	7 years	$	17,401		$	18,631
Vehicles	5 years		5,059			13,320
Equipment	3-7 years		33,315			32,177
Furniture and fixtures	7 years		2,998			2,938
Leasehold improvements	7 years		6,824			6,767
Aircraft	10 years		834			834
Building	39 years		2,975			2,975
			69,406			77,642
Land			725			725
Construction in progress			1,292			219
Less accumulated depreciation			(41,871	)		(44,187	)
Total property and equipment—    net		$	29,552		$	34,399