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Property, Plant and Equipment, Net
 6 Months Ended
Jun. 30, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Net Property, Plant and Equipment, Net
Property, plant and equipment were comprised of the following:

June 30,December 31,
20212020
Lab and SmileShop equipment$122,412 $116,340 
Computer equipment and software125,460 91,595 
Leasehold improvements26,184 25,721 
Furniture and fixtures13,732 13,627 
Vehicles7,877 6,266 
Construction in progress
31,482 31,796 
327,147 285,345 
Less: accumulated depreciation
(127,203)(95,350)
Property, plant and equipment, net
$199,944 $189,995 

The carrying values of assets under finance leases were $15,667 and $20,484 as of June 30, 2021 and December 31, 2020, respectively, net of accumulated depreciation of $20,261 and $15,444, respectively.