Property, plant and equipment (Tables)

9 Months Ended

Sep. 30, 2018

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Elements of property, plant and equipment are as follows:

	September 30, 2018		December 31, 2017		Estimated Lives
(in thousands)
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		3,045		3,045	25-39 years
- Cylinders		13,381		13,390	15-30 years
- Equipment		23,866		23,524	3-10 years
- Equipment under capital lease		315		315	5-7 years
- Vehicles		1,580		1,612	3-5 years
- Lab and computer equipment, software		3,090		3,056	2-8 years
- Furniture & fixtures		684		656	5-10 years
- Leasehold improvements		864		711	3-5 years
- Equipment under construction		570		385
Subtotal		50,415		49,714
Accumulated depreciation		22,085		19,253
Total	$	28,330	$	30,461