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Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
CONSOLIDATED STATEMENTS OF OPERATIONS        
Revenue $ 2,445 $ 664 $ 2,862 $ 600
Cost of sales (1,205) (406) (1,770) (355)
Gross margin 1,240 258 1,092 245
Other operating expenses        
Research and development 24,380 18,751 93,136 95,267
General and administrative 10,520 7,945 46,725 37,176
Other 10,188 10,021 35,531 26,645
Loss from operations (43,848) (36,459) (174,300) (158,843)
Department of Energy cost share 20,462 14,736 73,522 71,109
Interest expense and other     (1,715) (653)
Net income (loss) $ (23,373) $ (22,666) $ (102,493) $ (88,387)