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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 |
5. | Property, Plant and Equipment
|  | December 31, |
(table only in thousands) |  | 2020 |  |  | 2019 |
Land |  | $ | — |  |  | $ | 147 |
Building and improvements |  |  | 7,594 |  |  |  | 7,400 |
Machinery and equipment |  |  | 26,939 |  |  |  | 26,993 |
Property, plant and equipment, gross |  |  | 34,533 |  |  |  | 34,540 |
Less accumulated depreciation |  |  | (18,305 | ) |  |  | (19,266 | )
Property, plant and equipment, net |  | $ | 16,228 |  |  | $ | 15,274 |
Depreciation expense was $2.5 million, $2.1 million and $3.5 million for 2020, 2019 and 2018, respectively.

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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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