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Property and Equipment, Net
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net PROPERTY AND EQUIPMENT, NET
Property and equipment consist of the following (in thousands):
December 31,
20212020
Laboratory equipment$7,474 $7,268 
Office equipment and furniture2,034 1,133 
Leasehold improvements8,745 7,985 
Property and equipment, gross18,253 16,386 
Less: accumulated depreciation(15,891)(14,450)
Total property and equipment, net$2,362 $1,936 
We recognized depreciation expense in the amount of $1.4 million, $1.8 million, and $2.5 million for the years ended December 31, 2021, 2020 and 2019, respectively.