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Property, Plant and Equipment, Net
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Net Property, Plant and Equipment, Net
Property, plant and equipment, net consisted of the following (in thousands):
December 31,
20242023
Production equipment$7,474 $6,253 
Lab equipment1,921 2,502 
Leasehold improvements11,555 11,152 
Furniture, fixtures and other equipment300 376 
Construction in progress8,219 10,527 
Property, plant and equipment, at cost29,469 30,810 
Less: accumulated depreciation and amortization(11,988)(9,050)
Property, plant and equipment, net$17,481 $21,760 
Construction in progress consisted primarily of production and other equipment that have not been placed in service as of December 31, 2024 and 2023.
Depreciation and amortization expense was $3.8 million and $1.8 million during the years ended December 31, 2024 and 2023, respectively.
Due to a change in our plan regarding certain production equipment for our manufacturing facility in Fremont, California, we retired such equipment because it had no alternative use, and we recognized a loss of $1.9 million during the year ended December 31, 2024. There were no retirements of assets during the year ended December 31, 2023.