Annual report pursuant to Section 13 and 15(d)

Inventory (Details)

v3.22.0.1
Inventory (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Supplies $ 4,557 $ 6,312
Raw materials 701 613
Work in process 2,435 3,478
Finished goods 673 1,617
Total inventory $ 8,366 $ 12,020