Property and Equipment (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2020

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Property and Equipment, Net

Property and equipment, net, as of September 30, 2020 and December 31, 2019 consisted of the following:

	Estimated Useful Life		September 30, 2020			December 31, 2019
Lab and test equipment		7 years	$	17,755		$	14,810
Vehicles		5 years		12,869			11,073
Equipment		3–7 years		31,539			29,922
Furniture and fixtures		7 years		2,854			1,119
Leasehold improvements		7 years		6,758			5,954
Aircraft		10 years		834			—
Building		39 years		2,975			—
				75,584			62,878
Land				725			—
Construction in progress				156			796
Less accumulated depreciation				(41,906	)		(36,638	)
Total property and equipment—net			$	34,559		$	27,036

Property and equipment, net, as of December 31, 2019 and 2018 consisted of the following:

	Estimated Useful Life		2019			2018
Lab and test equipment		7 years	$	14,810		$	10,275
Vehicles		5 years		11,073			8,122
Equipment		3-7 years		29,922			25,468
Furniture and fixtures		7 years		1,119			1,004
Leasehold improvements		7 years		5,954			5,137
				62,878			50,006
Construction in progress				796
Less accumulated depreciation and amortization				(36,638	)		(29,214	)
Total property and equipment—net			$	27,036		$	20,792