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Inventories (Tables)
12 Months Ended
Dec. 31, 2021
Inventories  
Schedule of inventories

    

December 31, 

December 31, 

2020

    

2021

(in thousands)

 

Finished goods

$

23,990

53,884

Work in process

 

63,025

107,355

Raw materials

 

21,346

36,963

Supplies

 

346

398

$

108,707

198,600