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Inventories
12 Months Ended
Dec. 31, 2021
Inventories  
Inventories

Note 12. 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

The amounts of inventories that were charged to cost of revenues were $508,469 thousand, $654,582 thousand and $789,071 thousand, for the years ended December 31,2019, 2020 and 2021, respectively, and the charges for inventories written down to net realizable value amounted to $25,447 thousand, $11,919 thousand and $9,448 thousand, for the years ended December 31, 2019, 2020 and 2021, respectively, which were also included in cost of revenues.

As of December 31, 2020 and 2021, none of the Company’s inventories was pledged as collateral.