6. FIXED ASSETS

Property, equipment, and leasehold improvements, net consisted of the following:


	March 31,		December 31,
(In thousands)	2020		2019
Computer software and hardware	$	131	$	131
Research and lab equipment		520		520
Leasehold improvements		66		66
Property and equipment		717		717
Less accumulated depreciation and amortization		(651)		(644)
Property and equipment, net	$	66	$	73

Depreciation expense for the three months ended March 31, 2020 and 2019, was $7 thousand, and $12 thousand, respectively. Maintenance and repairs are charged to expense as incurred and any additions or improvements are capitalized.