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Property, plant and equipment, net
 9 Months Ended
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, 2020As 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.