Property, plant and equipment (Tables)

9 Months Ended

Sep. 30, 2022

Property, plant and equipment

Schedule of elements of property, plant and equipment

	September 30,		December 31,		Estimated
	2022		2021		Lives
(in thousands)	(unaudited)
Property, plant and equipment
- Land	$	1,255	$	1,255
- Land improvements		319		319	6-10 years
- Buildings		1,446		1,446	25-39 years
- Building improvements		3,099		3,099	25-39 years
- Cylinders		13,222		13,272	15-30 years
- Equipment		26,505		26,653	3-10 years
- Equipment under capital lease		315		315	5-7 years
- Vehicles		1,773		1,773	3-5 years
- Lab and computer equipment, software		3,103		3,103	2-8 years
- Furniture & fixtures		840		837	5-10 years
- Leasehold improvements		852		852	3-5 years
- Equipment under construction		2,732		930
Subtotal		55,461		53,854
Less: Accumulated depreciation		(36,108)		(33,761)
Total	$	19,353	$	20,093