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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment Property, plant, and equipment are stated at cost and finance lease assets are included. A summary of property, plant, and equipment as of December 31, 2020 and 2019, is as follows:
|  | December 31,
(in thousands) |  | 2020 |  | 2019
Manufacturing equipment |  | $ | 62,521 |  |  | $ | 37,939 |
Research and development equipment |  | 12,342 |  |  | 8,933 |
Leasehold improvements |  | 9,277 |  |  | 7,620 |
Building |  | 12,569 |  |  | — |
Finance leases |  | 212 |  |  | 1,108 |
Software |  | 402 |  |  | 274 |
Furniture and fixtures |  | 614 |  |  | 433 |
Vehicles |  | 377 |  |  | 210 |
Land |  | 3,995 |  |  | — |
Assets not yet placed in service |  | 46,148 |  |  | 11,666 |
Total property, plant and equipment |  | $ | 148,457 |  |  | $ | 68,183 |
Less: accumulated depreciation and amortization |  | 33,158 |  |  | 20,709 |
Property, plant and equipment, net |  | $ | 115,299 |  |  | $ | 47,474 |
Depreciation and amortization expense in 2020, 2019, and 2018 was $13.3 million, $8.1 million, and $4.9 million, respectively. Of the total depreciation and amortization expense in 2020, 2019 and 2018, $10.1 million, $5.7 million and $3.7 million, respectively, were recorded in cost of goods sold, $3.1 million, $2.4 million and $1.2 million, respectively, were recorded in research and development expenses, and $0.1 million, $71,000 and $13,000, respectively, were recorded in SG&A expenses, in the Company’s consolidated statements of operations. The Company had no property, plant and equipment concluded to meet the criteria for assets held for sale in prepaid expenses and other current assets on the consolidated balance sheet as of December 31, 2020. For the year ended 2019, the Company had $2.6 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 consolidated balance sheets. Amounts previously classified as assets held for sale were sold for amounts that approximated book value for which a note receivable of $4.6 million, net of payments received, was recorded as of December 31, 2020, of which $2.4 million is included in prepaid expenses and other current assets and $2.2 million is included in other non-current assets.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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