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Property and equipment, net
 6 Months Ended
Jun. 30, 2024
Property, Plant and Equipment [Abstract]  
Property and equipment, net Property and equipment, net
Property and equipment, net consisted of the following:
December 31, 2023June 30, 2024
Computers$3,517 $3,757 
Land53,405 53,405 
Building43,947 63,126 
Laboratory equipment70,350 76,136 
Leasehold improvements73,944 88,411 
Operating lease right-of-use assets73,141 70,156 
Property and equipment318,304 354,991 
Less: accumulated depreciation(30,608)(36,109)
Property and equipment, net$287,696 $318,882 
As of December 31, 2023 and June 30, 2024, property and equipment includes leasehold improvements and construction in progress in the amount of $91.0 million and $108.2 million, respectively, and construction deposits of $13.7 million and $13.0 million, respectively, that have not commenced depreciation. Depreciation expense on property and equipment for the three and six months ended June 30, 2023 was $3.0 million and $5.8 million, respectively, and $3.4 million and $6.6 million for the three and six months ended June 30, 2024, respectively.