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Property, Machinery and Equipment, net
 9 Months Ended
Sep. 30, 2021
Property, Plant and Equipment [Abstract]  
Property, Machinery and Equipment, net Property, Machinery and Equipment, net
Property, machinery and equipment, net consisted of the following:
(in thousands)September 30,
2021		December 31,
2020
Computer equipment$178 $178 
Furniture and fixtures206 206 
Leasehold improvements2,533 665 
Machinery and equipment3,136 1,936 
Construction in-progress245 118 
Property, machinery and equipment, gross6,299 3,103 
Less: accumulated depreciation(1,513)(782)
Property, machinery and equipment, net$4,786 $2,321 
Depreciation expense related to property, machinery and equipment was $0.3 million and $0.7 million for the three and nine months ended September 30, 2021, respectively, and was $0.1 million and $0.4 million for the three and nine months ended September 30, 2020, respectively.