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

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Schedule of Property and Equipment

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