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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment |
Property, Plant and Equipment | 8. Property, Plant and Equipment ​ Property, plant and equipment at December 31, 2020 and 2019 consists of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 | ​ | December 31, 2019 |
Land | ​ | ​ | 1,165 | ​ | ​ | — | ​
Leasehold improvements | ​ | $ | 1,121 | ​ | $ | 862 | ​
Software, machinery and equipment | ​ |  | 94,449 | ​ |  | 31,514 | ​
Property, plant, and equipment | ​ |  | 96,735 | ​ |  | 32,376 | ​
Less: accumulated depreciation | ​ |  | (22,186) | ​ |  | (17,417) | ​
Property, plant, and equipment, net | ​ | $ | 74,549 | ​ | $ | 14,959 | ​
​ Depreciation expense related to property, plant and equipment was $4.8 million, $3.6 million, and $2.6 million for the years ended December 31, 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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