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Inventories
12 Months Ended
Dec. 31, 2022
Inventories  
Inventories

Note 12. Inventories

    

December 31, 

December 31, 

2021

    

2022

(in thousands)

 

Finished goods

$

53,884

63,425

Work in process

 

107,355

169,166

Raw materials

 

36,963

138,086

Supplies

 

398

256

$

198,600

370,933

The amounts of inventories that were charged to cost of revenues were $654,582 thousand, $789,071 thousand and $692,022 thousand, for the years ended December 31, 2020, 2021 and 2022, respectively, and the charges for inventories written down to net realizable value amounted to $11,919 thousand, $9,448 thousand and $22,211 thousand, for the years ended December 31, 2020, 2021 and 2022, respectively, which were also included in cost of revenues.

As of December 31, 2021 and 2022, none of the Company’s inventories was pledged as collateral.