Basis of Presentation and Summary of Significant Accounting Policies (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2021

Dec. 31, 2020

Accounting Policies [Abstract]

Schedule of Property and Equipment

Property and equipment consisted of the following (in thousands):

	March 31, 2021		December 31, 2020
Computer hardware and software	$	2,559	$	2,450
Demonstration fleet and demonstration units	1,669		1,821
Machinery and equipment	6,596		5,940
Furniture and fixtures	293		293
Vehicles	856		835
Leasehold improvements	960		791
Construction in progress	1,841		1,410
Total property and equipment	14,774		13,540
Accumulated depreciation and amortization	(6,408)		(5,851)
Total property and equipment, net	$	8,366	$	7,689

Property and equipment capitalized under finance lease (capital lease prior to adoption of ASC 842) consisted of the following (in thousands):

	March 31, 2021		December 31, 2020
Computer hardware and software	$	88	$	88
Machinery and equipment	838		838
Total property and equipment, gross	926		926
Less: accumulated depreciation	(261)		(219)
Total property and equipment, net	$	665	$	707

Property and equipment are stated at cost less accumulated depreciation and amortization, and is depreciated using the straight-line method over the estimated useful lives of the assets as follows:

Asset Category	Estimated useful lives
Computer hardware and software	3 to 5 years
Demonstration units and fleet	2 to 5 years
Machinery and equipment	5 to 7 years
Furniture and fixtures	7 years
Vehicles	5 years
Leasehold improvements	Shorter of useful life or lease term

Property and equipment consisted of the following (in thousands):

	December 31,
	2020		2019
Computer hardware and software	$	2,450	$	2,992
Demonstration fleet and demonstration units	1,821		1,603
Machinery and equipment	5,940		5,321
Furniture and fixtures	293		325
Vehicles	835		902
Leasehold improvements	791		821
Construction in progress	1,410		465
Total property and equipment	13,540		12,429
Accumulated depreciation and amortization	(5,851)		(4,562)
Total property and equipment, net	$	7,689	$	7,867