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The Company - U.S. Department of Energy Carbon Free Power Project Award (Details) - Carbon Free Power Project Award (Award 8369) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Jan. 31, 2019
Apr. 30, 2015
Dec. 31, 2021
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]      
Cost share $ 8,250 $ 16,617  
Cost share (as a percent) 50.00% 50.00%  
Maximum amount awarded $ 126,694    
Cumulative cash received     $ 7,451
Amount paid to third party for services provided     $ 729
Reimburse percentage     25.00%
Maximum reimbursement amount     $ 4,100
Accounts Receivable [Member]      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]      
Amount obligated under current budget period     $ 70
Government [Member]      
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]      
Cost share $ 8,250 $ 16,617  
Cost share (as a percent) 50.00% 50.00%