Property, plant and equipment (Tables)

3 Months Ended

Mar. 31, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Elements of property, plant and equipment are as follows:

	March 31,		December 31,		Estimated
	2017		2016		Lives
(in thousands)	(unaudited)
Property, plant and equipment
- Land	$	535	$	535
- Buildings		830		830		39 years
- Building improvements		873		873		39 years
- Equipment		13,516		13,423		3-7 years
- Equipment under capital lease		188		248		5-7 years
- Vehicles		1,337		1,360		5 years
- Lab and computer equipment, software		2,726		2,652		3-5 years
- Furniture & fixtures		288		289		7-8 years
- Leasehold improvements		119		119		3 years
- Equipment under construction		1,919		1,654
Subtotal		22,331		21,983
Accumulated depreciation		14,913		14,451
Total	$	7,418	$	7,532