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Property, plant and equipment (Tables)
6 Months Ended
Jun. 30, 2025
Property, plant and equipment  
Schedule of elements of property, plant and equipment

    

June 30, 

    

December 31, 

    

Estimated

2025

2024

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

 

3,591

 

3,569

 

25-39 years

- Cylinders

 

12,914

 

12,957

 

15-30 years

- Equipment

 

32,530

 

32,525

 

3-10 years

- Equipment under capital lease

 

315

 

315

 

5-7 years

- Vehicles

 

2,250

 

2,081

 

3-5 years

- Lab and computer equipment, software

 

3,304

 

3,304

 

2-8 years

- Furniture and fixtures

 

1,125

 

1,125

 

5-10 years

- Leasehold improvements

 

865

 

865

 

3-5 years

- Construction-in-progress

 

6,206

 

4,237

 

  

Subtotal

 

66,120

 

63,998

 

  

Less: Accumulated depreciation

 

(43,901)

 

(42,444)

 

  

Total

$

22,219

$

21,554