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PROPERTY, PLANT AND EQUIPMENT (Tables)
6 Months Ended
Jun. 30, 2021
Property, Plant and Equipment [Abstract]  
Summary of Property and Equipment
Presented in the table below are the major classes of property, plant and equipment by category as of the below dates:
As of June 30, 2021
(in thousands)CostAccumulated DepreciationNet Book Value
Building$12,029 $541 $11,488 
Machinery and equipment16,106 3,206 12,900 
Fixtures and Furnishings104 30 74 
Land improvements150 143 
Land1,150 — 1,150 
Construction in process112,656 — 112,656 
Total property, plant and equipment$142,195 $3,784 $138,411 
As of December 31, 2020
(in thousands)CostAccumulated
Depreciation
Net Book Value
Building$12,029 $387 $11,642 
Machinery and equipment15,982 2,388 13,594 
Fixtures and Furnishings104 22 82 
Land improvements150 147 
Land1,150 — 1,150 
Construction in process43,603 — 43,603 
Total property, plant and equipment$73,018 $2,800 $70,218