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PROPERTY AND EQUIPMENT, NET (Tables) | 12 Months Ended
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Dec. 31, 2021
PROPERTY AND EQUIPMENT, NET |
Schedule of property and equipment, net | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Estimated Useful | ​ | December 31, | ​ | December 31,
​ |  | Life (in years) |  | 2021 |  | 2020
Buildings | ​ | 25 | ​ | $ | 1,625 | ​ | $ | 1,776
Machinery and equipment | ​ | 5 to 8 | ​ |  | 133,010 | ​ |  | 115,404
Computer equipment, furniture, fixtures, and vehicles | ​ | 3 to 5 | ​ |  | 33,490 | ​ |  | 31,237
Leasehold improvements | ​ | 2 to 10 | ​ |  | 48,370 | ​ |  | 42,984
Construction in process | ​ | ​ | ​ |  | 5,914 | ​ |  | 3,693
​ | ​ | ​ | ​ |  | 222,409 | ​ |  | 195,094
Less: Accumulated depreciation | ​ | ​ | ​ |  | (107,579) | ​ |  | (80,363)
Property and equipment, net | ​ | ​ | ​ | $ | 114,830 | ​ | $ | 114,731
​
Schedule of depreciation expense recorded in continuing operations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Years Ended December 31,
​ | 2021 |  | 2020 |  | 2019
Depreciation expense | $ | 30,833 | ​ | $ | 27,641 | ​ | $ | 13,979

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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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