Property and Equipment

9 Months Ended

12 Months Ended

Sep. 30, 2019

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Property and Equipment

Note 6 - Property and Equipment

Property and equipment, net consist of the following:

			September 30,			December 31,
		Useful Life	2019			2018
Research and development equipment		5 years	$	1,582		$	1,552
Office and computer equipment	(1)	3 years		753			742
Autos		5 years		54			54
Furniture and fixtures		7 years		37			37
Leasehold improvements		*		283			283
				2,709			2,668
Less accumulated depreciation and amortization				(1,879	)		(1,585	)
Total			$	830		$	1,083

* Shorter of lease term or estimated useful life

(1) In August 2019, the Company disposed of computer equipment with a net book value of $2 resulting in a loss on the disposal of fixed assets of less than $1. In April and May 2019, the Company disposed of obsolete computer equipment with a net book value of $2 resulting in a loss on disposal of fixed assets of $2.

Depreciation and amortization expense was approximately $101 and $108 for the three months ended September 30, 2019 and 2018, respectively, and $314 and $332 for the nine months ended September 30, 2019 and 2018, respectively.

7. Property and Equipment

Property and equipment, net consist of the following: 

		December 31,
	Useful Life	2018		2017
Research and development equipment	5 years	$	1,552	$	1,349
Office and computer equipment	3 years		742		672
Autos	5 years		54		305
Furniture and fixtures	7 years		37		34
Leasehold improvements	*		283		283
			2,668		2,643
Less accumulated depreciation and amortization			1,585		1,189
Total		$	1,083	$	1,454

* Shorter of lease term or estimated useful life

Depreciation and amortization expense was approximately $447 and $391 for the year ended December 31, 2018 and 2017, respectively.