Property, Plant and Equipment

6 Months Ended

Jun. 30, 2020

Property, Plant and Equipment.

Property, Plant and Equipment

4.    Property, Plant and Equipment

Property, plant and equipment was comprised of the following at June 30, 2020 and December 31, 2019:

	June 30,		December 31,
	2020		2019
Systems and related equipment		297,297	$	294,547
Systems in process		11,386		11,867
Transloading facility and equipment		—		40,272
Computer hardware and software		980		1,335
Machinery and equipment		5,242		5,214
Vehicles		3,736		7,633
Buildings		4,342		4,339
Land		612		612
Furniture and fixtures		238		284
Property, plant and equipment, gross		323,833		366,103
Less: accumulated depreciation		(68,294)		(59,520)
Property, plant and equipment, net	$	255,539	$	306,583

Depreciation expense for the three months ended June 30, 2020 and 2019 was $6,480 and $6,429, respectively.

As described in Note 2, $37,775 of impairment losses were recognized for property, plant and equipment, associated primarily with transloading facility and equipment during the three months ended March 31, 2020.

There were no impairment indicators for the three and six months ended June 30, 2019 and for the three months ended June 30, 2020.