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Property and equipment, net
9 Months Ended
Sep. 30, 2023
Property, Plant and Equipment [Abstract]  
Property and equipment, net Property and equipment, net
Property and equipment, net consisted of the following:
December 31, 2022September 30, 2023
Computers$8,303 $3,484 
Land53,405 53,405 
Building11,361 34,062 
Laboratory equipment41,256 68,198 
Leasehold improvements40,567 65,591 
Operating lease right-of-use assets80,838 79,499 
Property and equipment235,730 304,239 
Less accumulated depreciation(18,475)(27,030)
Property and equipment, net$217,255 $277,209 
As of December 31, 2022 and September 30, 2023, property and equipment includes leasehold improvements and construction in progress in the amount of $25.6 million and $72.5 million, respectively, and construction deposits of nil and $13.2 million, respectively, that have not commenced depreciation. Depreciation expense on property and equipment for the three and nine months ended September 30, 2022 was $2.5 million and $6.2 million, respectively, and $3.1 million and $8.9 million for the three and nine months ended September 30, 2023, respectively.