Property and equipment, net (Tables)

12 Months Ended

Dec. 31, 2017

Property and equipment, net, consisted of the following for the dates indicated (in thousands):

	Useful Life		December 31,
Asset Class	(Years)		2017			2016

Operational equipment		3-10	$	15,457		$	15,132
Lab equipment		5		685			547
Computer equipment		3		174			140
Office furniture and equipment		3		326			298
Leasehold improvements		5-7		1,408			1,408
Land		—		1,047			1,047
Building		39		24,847			21,962
Asset Retirement Cost		20		670			—
Equipment under construction				4,552			1,635
				49,166			42,169
Less: accumulated depreciation				(3,433	)		(777	)

			$	45,733		$	41,392