Property, Plant, and Equipment

9 Months Ended

Sep. 30, 2021

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

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

	Estimated Useful Lives (Years)	September 30,		December 31,
		2021		2020
Land	N/A	$	1,340	$	1,340
Buildings and land improvements	15-39	2,486		2,486
Manufacturing equipment	7	13,791		13,261
Furniture, fixtures and equipment	5-7	477		443
Vehicles	5	161		140
Hardware and software	3-5	1,603		887
Machinery in progress		951		—
Total		20,809		18,557
Less: accumulated depreciation		(10,607)		(8,783)
Property, plant and equipment, net		$	10,202	$	9,774

Depreciation expense was $0.6 million and $0.6 million for the three months ended September 30, 2021 and 2020, respectively, of which $0.5 million and $0.5 million, respectively, has been allocated to cost of revenue and $0.1 million and $0.1 million, respectively, is included in depreciation and amortization in the accompanying condensed consolidated statements of operations for the three months ended September 30, 2021 and 2020.

Depreciation expense was $1.8 million and $1.8 million for the nine months ended September 30, 2021 and 2020, respectively, of which $1.5 million and $1.5 million, respectively, has been allocated to cost of revenue and $0.3 million and $0.3 million, respectively, is included in depreciation and amortization in the accompanying consolidated statements of operations for the nine months ended September 30, 2021 and 2020.