Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Schedule of 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