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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Mar. 31, 2022
Dec. 31, 2020
Accounts Receivable      
Deferred DOE cost share liabilities $ 10,237 $ 10,237 $ 0
In-process Research and Development      
Discount rate to assign in-process research and development 20.00%    
Revenue Recognition      
Customer payments term 30 days