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Property, plant and equipment, net | 9 Months Ended
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Sep. 30, 2021
Property, Plant and Equipment [Abstract] |
Property, plant and equipment, net | Property, plant and equipment, net The following table provides the gross and net amount of property, plant and equipment:
| As of December 31, 2020 |  | As of September 30, 2021
Property, plant and equipment, gross | $ | 792,463 |  |  | $ | 802,488 |
Less: Accumulated depreciation, amortization and impairment | (561,341) |  |  | (594,568) |
Property, plant and equipment, net | $ | 231,122 |  |  | $ | 207,920 |
Depreciation expense on property, plant and equipment for the nine months ended September 30, 2020 and 2021 was $50,863 and $46,305, respectively, and for the three months ended September 30, 2020 and 2021 was $17,257 and $14,131, respectively. Computer software amortization for the nine months ended September 30, 2020 and 2021 was $7,399 and $4,469, respectively, and for the three months ended September 30, 2020 and 2021 was $1,889 and $1,461, respectively. The Company recorded a write-down to certain property, plant and equipment during the three months ended September 30, 2020 and nine months ended September 30, 2020 and 2021, as described in Note 10.

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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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