PROPERTY AND EQUIPMENT

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

PROPERTY AND EQUIPMENT

7.  PROPERTY AND EQUIPMENT

The following table sets forth the composition of property and equipment, net as of December 31, 2021 and 2020 (in thousands):

	December 31,
	2021		2020
Lab equipment	$	569	$	570
Furniture and fixtures		16		16
Computer equipment		99		97
Software		32		28
Leasehold improvements		293		293
Property and equipment, gross		1,009		1,004
Less: accumulated depreciation		(966)		(881)
Total Property and Equipment, Net	$	43	$	123

Depreciation expense was $0.1 million, $0.1 million and $0.2 million for the years ended December 31, 2021, 2020 and 2019, respectively.