Property, Plant and Equipment

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Property, plant, and equipment are stated at cost and capital lease assets are included. A summary of property, plant, and equipment as of December 31, 2019 and 2018, is as follows:



	December 31,
(in thousands)	2019		2018
Manufacturing equipment	$	37,939	$	25,314
Research and development equipment	8,933		6,088
Leasehold improvements	7,620		7,080
Capital leases	1,108		882
Software	274		60
Furniture and fixtures	433		195
Vehicles	210		210
Assets not yet placed in service	11,666		3,374
Total property, plant and equipment	$	68,183	$	43,203
Less: accumulated depreciation and amortization	20,709		12,676
Property, plant and equipment, net	$	47,474	$	30,527

Depreciation and amortization expense in 2019, 2018, and 2017 was $8.1 million, $4.9 million, and 3.2 million, respectively. Of the total depreciation and amortization expense in 2019, 2018 and 2017, $5.7 million, $3.7 million and $2.9 million, respectively, were recorded in cost of goods sold, $2.4 million, $1.2 million and $0.3 million, respectively, were recorded in research and development expenses, and $71,000, $13,000 and $0, respectively, were recorded in SG&A expenses, in the Company’s statements of operations.

The Company had $2.6 million and $1.0 million in property, plant and equipment concluded to meet the criteria for assets held for sale in prepaid expenses and other current assets on the balance sheets as of December 31, 2019 and 2018, respectively. The Company expects to sell such assets in 2020 for amounts that approximate book value.