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PROPERTY AND EQUIPMENT, NET (Tables) | 6 Months Ended
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Jun. 30, 2021
PROPERTY AND EQUIPMENT, NET |
Schedule of property and equipment, net | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2021 |  | 2020
Buildings and land | ​ | $ | 2,832 | ​ | $ | 1,776
Machinery and equipment | ​ |  | 120,295 | ​ |  | 115,404
Computer and communication equipment | ​ |  | 28,695 | ​ |  | 26,623
Furniture and fixtures | ​ |  | 4,459 | ​ |  | 4,352
Vehicles | ​ |  | 261 | ​ |  | 262
Leasehold improvements | ​ |  | 44,757 | ​ |  | 42,984
Construction in process | ​ |  | 5,400 | ​ |  | 3,693
​ | ​ |  | 206,699 | ​ |  | 195,094
Less: Accumulated depreciation | ​ |  | (91,539) | ​ |  | (80,363)
Property and equipment, net | ​ | $ | 115,160 | ​ | $ | 114,731
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 June 30, | ​ | Six Months Ended June 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Depreciation expense | ​ | $ | 7,510 | ​ | $ | 6,571 | ​ | $ | 14,847 | ​ | $ | 13,181

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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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