Property and Equipment, Net

12 Months Ended

Dec. 31, 2022

Property, Plant and Equipment [Abstract]

Property and Equipment, Net

6. PROPERTY AND EQUIPMENT, NET

Property and equipment are stated at cost or estimated fair value for assets acquired through business combinations. Depreciation and amortization are provided using the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized using the straight-line method over the shorter of the remaining lease term, including options that are deemed to be reasonably assured, or the estimated useful life of the improvement.

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

	Estimated Useful Life	2022			2021
Lab and test equipment	7 years	$	21,171		$	18,581
Vehicles	5 years		5,732			5,414
Equipment	3-7 years		40,940			35,148
Furniture and fixtures	7 years		2,841			2,844
Leasehold improvements	7 years		8,576			7,268
Aircraft	10 years		931			931
Building	39 years		2,975			2,975
			83,166			73,161
Land			725			725
Construction in progress			3,150			2,342
Less accumulated depreciation			(50,996	)		(44,707	)
Total property and equipment—net		$	36,045		$	31,521

Total depreciation expense for property and equipment, net included on the consolidated statements of operations was $7.2 million, $6.4 million and $8.4 million for the years ended December 31, 2022, 2021, and 2020, respectively.