Property, Plant and Equipment, Net

9 Months Ended

12 Months Ended

Sep. 30, 2021

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Property, plant and equipment, net

5. Property, plant and equipment, net

Property, plant and equipment, net consisted of the following (in thousands):

	September 30, 2021		December 31, 2020
Laboratory equipment	338		338
Less: accumulated depreciation	(329	)	(317	)
	9		21

Depreciation expense for the three months ended September 30, 2021 and 2020 was $22 and $38 respectively; and for the nine months ended September 30, 2021 and 2020 was $90 and $110 and respectively.

7. Property, plant and equipment

Property, plant and equipment are recorded at historical cost, net of accumulated depreciation. Components of property, plant and equipment, net are summarized as follows (in thousands):

	As of December 31,
	2020		2019
Laboratory equipment	364		327
Less: accumulated depreciation	(343	)	(290	)
	21		37

The Company’s property, plant and equipment is pledged as collateral to its line of credit loan as disclosed in Note 10.

Depreciation expense was $21 and $26 for the years ended December 31, 2020 and 2019, respectively.