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Property and Equipment, Net
 3 Months Ended
Mar. 31, 2022
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net Property and Equipment, Net
Property and equipment, net, consisted of the following (in thousands):
 March 31, 2022December 31, 2021
Leasehold improvements$9,170 $9,052 
Laboratory and clean room equipment16,255 16,567 
Furniture and equipment14,975 14,975 
Construction in progress683 397 
Asset retirement cost929 863 
Finance lease right-of-use asset189 189 
Property and equipment, gross42,201 42,043 
Less: accumulated depreciation(33,442)(32,878)
Property and equipment, net$8,759 $9,165 
Depreciation expense for the three months ended March 31, 2022 and 2021, respectively, is summarized in the table below (amounts in thousands):
Three Months Ended March 31,
20222021
Depreciation expense$860 $1,161 
Depreciation expense is allocated amongst cost of sales, research and development expense, and selling, general, and administrative expense on the unaudited condensed consolidated statements of operations.