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PROPERTY AND EQUIPMENT, NET - Details of property and equipment (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 197,878 | $ 195,094
Less: Accumulated depreciation | (85,036) | (80,363)
Property and equipment, net | 112,842 | 114,731
Buildings and Land [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 2,187 | 1,776
Machinery and Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 115,496 | 115,404
Computer and Communication Equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 27,472 | 26,623
Furniture and Fixtures [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 4,384 | 4,352
Vehicles [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 261 | 262
Leasehold Improvements [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 42,331 | 42,984
Construction in Process [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 5,747 | $ 3,693

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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: 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 + Details
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