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Property, Plant and Equipment
 6 Months Ended
Jun. 30, 2022
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
Property, plant and equipment consist of the following:
(in thousands)June 30, 2022December 31, 2021
Land$723 $723 
Leasehold improvements3,388 4,641 
Buildings1,475 53 
Machinery, fixtures and equipment111,497 110,127 
Construction-in-progress3,022 1,900 
120,105 117,444 
Less: accumulated depreciation and amortization(77,928)(73,724)
Property, plant and equipment, net$42,177 $43,720 

The following table sets forth depreciation expense related to property, plant and equipment:
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)2022202120222021
Cost of sales$2,031 $1,713 $4,086 $3,447 
Selling, general and administrative61 61 122 144 
Total depreciation$2,092 $1,774 $4,208 $3,591