9. PROPERTY AND EQUIPMENT

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

9. PROPERTY AND EQUIPMENT

9. PROPERTY AND EQUIPMENT

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

		December 31,
		2021		2020
Production equipment	$	8,224	$	7,210
Leasehold improvements		913		913
Computer hardware and software/lab equipment		7,230		6,226
Office furniture and equipment		1,372		1,345
Property, gross		17,739		15,694
Less: Accumulated depreciation		(14,713)		(13,811)
Property, net	$	3,026	$	1,883

Depreciation expense was $902,000 in 2021, $442,000 in 2020 and $1.1 million in 2019.