Property, plant and equipment

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property, plant and equipment

Note 5 - Property, plant and equipment

Elements of property, plant and equipment are as follows:

December 31 ,	2017		2016		Estimated  Lives
(in thousands)
Property, plant and equipment
- Land	$	1,255	$	535
- Land improvements		319		—	6-10 years
- Buildings		1,446		830	25-39 years
- Building improvements		3,045		873	25-39 years
- Cylinders		13,390		—	15-30 years
- Equipment		23,524		13,423	3-10 years
- Equipment under capital lease		315		248	5-7 years
- Vehicles		1,612		1,360	3-5 years
- Lab and computer equipment, software		3,056		2,652	2-8 years
- Furniture &; fixtures		656		289	5-10 years
- Leasehold improvements		711		119	3-5 years
- Equipment under construction		385		1,654
Subtotal		49,714		21,983
Accumulated depreciation		19,253		14,451
Total	$	30,461	$	7,532

Depreciation expense for the years ended December 31, 2017, 2016 and 2015 was $ 2.3 million, $1.7 million, and $1.6 million, respectively, of which $2.0 million, $1.7 million, and $1.5 million, respectively, were included as cost of sales in the Company’s Consolidated Statements of Operations.