Property, plant and equipment (Tables)

12 Months Ended

Dec. 31, 2014

Property, Plant and Equipment [Abstract]

Property, plant, and equipment

Elements of property, plant and equipment are as follows:

December 31,	2014		2013		Estimated Lives
(in thousands)
Property, plant and equipment
- Land	$	535	$	535
- Buildings		830		830	39 years
- Building improvements		776		776	39 years
- Equipment		12,429		8,560	3-7 years
- Equipment under capital lease		100		137	5-7 years
- Vehicles		1,281		1,258	5 years
- Lab and computer equipment, software		2,377		2,210	3-5 years
- Furniture & fixtures		265		249	7-8 years
- Leasehold improvements		90		70	3 years
- Equipment under construction		225		37
Subtotal		18,908		14,662
Accumulated depreciation		11,021		10,126
Total	$	7,887	$	4,536