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Property, Plant and Equipment, Net | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT, NET | 6. PROPERTY, PLANT AND EQUIPMENT, NET Property, plant and equipment, net consisted of the following:
|  | December 31, 2019 |  | December 31, 2020
Machineries and equipment |  | $ | 73,535 |  |  | $ | 123,889 |
Buildings |  |  | 37,479 |  |  |  | 39,988 |
Leasehold improvements |  |  | 22,571 |  |  |  | 26,627 |
Fixtures and electronic equipment |  |  | 7,459 |  |  |  | 9,086 |
Motor vehicles |  |  | 4,641 |  |  |  | 8,073 |
Total |  |  | 145,685 |  |  |  | 207,663 |
Less: accumulated depreciation |  |  | (46,243 | ) |  |  | (67,043 | )
Construction in progress |  |  | 91,881 |  |  |  | 57,397 |
Property, plant and equipment, net |  | $ | 191,323 |  |  | $ | 198,017 |
The Group recorded depreciation expenses of $12,180, $14,676 and $16,097 for the years ended December 31, 2018, 2019 and 2020, respectively. $1,239, $2,908 and $567 impairment losses were recognized for the years ended December 31, 2018, 2019 and 2020, respectively, primarily related to the obsolete machineries and equipment as a result of technology development or product upgrade.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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