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Property and Equipment, Net
 12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net Property and Equipment, Net
Property and equipment, net, consists of the following (in thousands):
 December 31,
 20222021
Lab and clean room equipment$16,422 $16,567 
Furniture and office equipment15,016 14,975 
Leasehold improvements9,190 9,052 
Construction in progress1,983 397 
Asset retirement cost983 863 
Finance lease assets189 189 
Property and equipment, gross43,783 42,043 
Less: accumulated depreciation and amortization(35,927)(32,878)
Property and equipment, net of accumulated depreciation and amortization$7,856 $9,165 
Depreciation expense for each of the years ended December 31, 2022, 2021, and 2020 was recorded in certain captions of the consolidated statements of operations for those periods in the amounts shown in the table below (in thousands):
Year Ended December 31,
202220212020
Cost of sales$1,816 $1,787 $2,022 
Selling, general, and administrative expense1,243 2,278 3,416 
Research and development expense286 298 344 
Total$3,345 $4,363 $5,782