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PROPERTY, PLANT AND EQUIPMENT | 3 Months Ended
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Mar. 31, 2021
PROPERTY, PLANT AND EQUIPMENT |
PROPERTY, PLANT AND EQUIPMENT | 6. PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | As of March 31, |  | As of December 31,
​ | ​ | 2021 | ​ | 2020
Land | ​ | $ | 14,518 | ​ | $ | 12,968
Buildings and leasehold improvements | ​ |  | 10,828 | ​ |  | 10,700
Vehicles | ​ |  | 1,664 | ​ |  | 1,664
Machinery and equipment | ​ |  | 4,167 | ​ |  | 4,127
Furniture and fixtures | ​ |  | 298 | ​ |  | 298
Total | ​ |  | 31,475 | ​ |  | 29,757
Less accumulated depreciation | ​ |  | (7,405) | ​ |  | (7,141)
Total property, plant and equipment | ​ | $ | 24,070 | ​ | $ | 22,616
​ Depreciation expense was $264 with $104 included as a component of cost of product sales for the three months ended March 31, 2021 and $248 with $106 included as a component of cost of product sales for the three months ended March 31, 2020.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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