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Property, Plant and Equipment, Net
 9 Months Ended
Sep. 30, 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):
September 30,December 31,
20242023
Production equipment$6,959 $6,253 
Lab equipment2,536 2,502 
Leasehold improvements11,217 11,152 
Furniture, fixtures and other equipment385 376 
Construction in progress14,838 10,527 
Property, plant and equipment, at cost35,935 30,810 
Less: accumulated depreciation and amortization(11,967)(9,050)
Property, plant and equipment, net$23,968 $21,760 
Construction in progress consists primarily of production equipment that we purchased but have not yet placed in service, as well as pre-construction costs related to the planning of our GWh-scale manufacturing facility in Brighton, Colorado.
Depreciation and amortization expense was $0.8 million and $2.9 million during the three and nine months ended September 30, 2024, respectively, and $0.4 million and $1.3 million during the three and nine months ended September 30, 2023, respectively.