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Property, Plant and Equipment, net | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment, net. |
Property, Plant and Equipment, net | Note 7. Property, Plant and Equipment, net ​ The components of property, plant and equipment are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ |  | 2021 |  | 2020 |
​ | ​ | (in thousands) |
Land and buildings | ​ | $ | 15,881 | ​ | $ | 10,887 | ​
Machinery and equipment | ​ |  | 34,312 | ​ |  | 30,768 | ​
Construction in process | ​ |  | 6,852 | ​ |  | 6,697 | ​
Total cost | ​ |  | 57,045 | ​ |  | 48,352 | ​
Accumulated depreciation | ​ |  | (22,073) | ​ |  | (18,512) | ​
Property, plant and equipment, net | ​ | $ | 34,972 | ​ | $ | 29,840 | ​
​ Depreciation expense was $4.2 million, $3.4 million and $2.6 million for the years ended December 31, 2021, 2020 and 2019, 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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