Property and equipment, net (Tables)

3 Months Ended

Mar. 31, 2018

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

	Useful Life		March 31,			December 31,
Asset Class	(Years)		2018			2017

Operational equipment		3-10	$	15,478		$	15,457
Lab equipment		5		685			685
Computer equipment		3		174			174
Office furniture and equipment		3		326			326
Leasehold improvements		5-7		1,408			1,408
Land		—		1,047			1,047
Building		39		24,859			24,847
Asset retirement cost		20		670			670
Equipment under construction				6,147			4,552
				50,794			49,166
Less: accumulated depreciation				(4,211	)		(3,433	)

Total property and equipment, net			$	46,583		$	45,733