Property, Plant and Equipment

6 Months Ended

Jun. 30, 2019

Property, Plant and Equipment [Abstract]

Property, plant and equipment consists of the following:


	June 30, 2019		December 31, 2018
Land	$	401	$	401
Building and improvements	53,816		53,813
Machinery and equipment	12,566		12,229
Computer hardware and software	4,702		4,182
Furniture and fixtures	698		694
Construction in progress	35,839		30,949
	108,022		102,268
Less accumulated depreciation and amortization	(12,269)		(10,493)
Property, plant and equipment, net	$	95,753	$	91,775

The Company recorded depreciation expense of $0.9 million and $0.5 million for the three months ended June 30, 2019 and June 30, 2018, respectively. The Company recorded depreciation expense of $1.8 million and $1.1 million for the six months ended June 30, 2019 and June 30, 2018, respectively.

There was no interest expense capitalized as construction in progress during the three and six months ended June 30, 2019. Interest expense of $1.5 million and $2.8 million during the three and six months ended June 30, 2018 respectively was capitalized as construction in progress. In addition, during the three months ended June 30, 2019 and June 30, 2018, there was $0.3 million and $0.7 million of payroll costs, respectively, capitalized as construction in progress. For the six months ended June 30, 2019 and June 30, 2018, there was $0.6 million and $1.1 million of payroll costs, respectively, capitalized as construction in progress.