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PROPERTY AND EQUIPMENT, NET (Tables) | 3 Months Ended
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Mar. 31, 2022
PROPERTY AND EQUIPMENT, NET |
Schedule of property and equipment, net | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Estimated Useful | ​ | March 31, | ​ | December 31,
​ |  | Life (in years) |  | 2022 |  | 2021
Buildings | ​ | 25 | ​ | $ | 1,591 | ​ | $ | 1,625
Machinery and equipment | ​ | 5 to 8 | ​ |  | 136,610 | ​ |  | 133,010
Computer equipment, furniture, fixtures, and vehicles | ​ | 3 to 5 | ​ |  | 33,806 | ​ |  | 33,490
Leasehold improvements | ​ | 2 to 10 | ​ |  | 49,838 | ​ |  | 48,370
Construction in process | ​ | ​ | ​ |  | 10,788 | ​ |  | 5,914
​ | ​ | ​ | ​ |  | 232,633 | ​ |  | 222,409
Less: Accumulated depreciation | ​ | ​ | ​ |  | (115,346) | ​ |  | (107,579)
Property and equipment, net | ​ | ​ | ​ | $ | 117,287 | ​ | $ | 114,830
Schedule of depreciation expense recorded in continuing operations | The following table summarizes depreciation expense. All depreciation expense is recorded in income from continuing operations:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, | ​
​ |  | 2022 |  | 2021 |
Depreciation expense | ​ | $ | 8,379 | ​ | $ | 7,337 | ​

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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