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PROPERTY AND EQUIPMENT, NET (Tables) | 12 Months Ended
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Dec. 31, 2020
PROPERTY AND EQUIPMENT, NET |
Schedule of details of property and equipment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019
Buildings and land | ​ | $ | 1,776 | ​ | $ | 1,693
Machinery and equipment | ​ |  | 115,404 | ​ |  | 108,945
Computer and communication equipment | ​ |  | 26,623 | ​ |  | 29,106
Furniture and fixtures | ​ |  | 4,352 | ​ |  | 4,119
Vehicles | ​ |  | 262 | ​ |  | 262
Leasehold improvements | ​ |  | 42,984 | ​ |  | 33,041
Construction in process | ​ |  | 3,693 | ​ |  | 9,089
​ | ​ |  | 195,094 | ​ |  | 186,255
Less: Accumulated depreciation | ​ |  | (80,363) | ​ |  | (78,146)
Property and equipment, net | ​ | $ | 114,731 | ​ | $ | 108,109
Schedule of depreciation expense recorded in continuing operations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
​ |  | 2020 |  | 2019 |  | 2018
Depreciation expense | ​ | $ | 27,641 | ​ | $ | 13,979 | ​ | $ | 7,818

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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=6877327&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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