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NOTES PAYABLE AND DEBT INSTRUMENTS - Narrative (Details)
shares in Millions, lb in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 15, 2023
USD ($)
lb
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jan. 31, 2022
USD ($)
Jul. 31, 2021
USD ($)
Mar. 17, 2021
USD ($)
Oct. 07, 2020
USD ($)
serie
purchaser
supplier
Debt Instrument [Line Items]                  
Interest cost capitalized     $ 17.1 $ 17.1          
Number of suppliers | supplier                 1
Number of purchasers | purchaser                 2
Subsequent Event | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity $ 150.0                
Lenders and affiliates beneficial owners percentage (greater than) 5.00%                
Credit facility, up-front fee percentage 0.75%                
Credit facility, commitment fee percentage 0.25%                
Debt covenant, cross-defaults to other indebtedness amount $ 1.0                
Subsequent Event | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | From the Closing Date through June 30, 2023                  
Debt Instrument [Line Items]                  
Debt basis spread on variable rate 5.00%                
Subsequent Event | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | July 1, 2023 through September 30, 2023                  
Debt Instrument [Line Items]                  
Debt basis spread on variable rate 10.00%                
Subsequent Event | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | October 1, 2023 through December 31, 2023                  
Debt Instrument [Line Items]                  
Debt basis spread on variable rate 12.50%                
Subsequent Event | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | January 1, 2024 through March 31, 2024                  
Debt Instrument [Line Items]                  
Debt basis spread on variable rate 15.00%                
Subsequent Event | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Thereafter                  
Debt Instrument [Line Items]                  
Debt basis spread on variable rate 17.50%                
Subsequent Event | Ironton Facility                  
Debt Instrument [Line Items]                  
Loan Agreement, Limited Waiver terms, deposit in equity with the Trustee $ 87.3                
Loan Agreement, Limited Waiver terms, financing transaction milestone amount $ 150.0                
Loan Agreement, Limited Waiver terms, production targets | lb 107                
Loan Agreement, Limited Waiver terms, deposit controlled by the Trustee $ 50.0                
Loan Agreement, Limited Waiver terms, deposit in equity amount to fund remaining construction costs 25.0                
Loan Agreement, Limited Waiver terms, deposit into Capitalized Interest Accounts 12.3                
Loan Agreement, Limited Waiver terms, liquidity reserve escrow fund amount 50.0                
Loan Agreement, Limited Waiver terms, amount released from the Trustee for investment 13.2                
Subsequent Event | Ironton Facility | Minimum                  
Debt Instrument [Line Items]                  
Loan Agreement, Limited Waiver terms, liquidity reserve escrow fund amount $ 25.0                
Revenue Bonds                  
Debt Instrument [Line Items]                  
Number of debt offering series | serie                 3
Debt instrument, discount                 $ 5.5
Escrow deposit     50.5           $ 50.0
Operating revenue deposit requirement, percent                 100.00%
Equity investments               $ 40.0 $ 60.0
Cash required to maintain     100.0     $ 100.0 $ 75.0    
Interest expense     19.4 19.3 $ 4.3        
Interest cost capitalized     17.1 $ 17.1 $ 4.0        
Fair value of revenue bonds     $ 184.1            
Escrow deposit, stated conditions satisfied, amount                 $ 25.0
Convertible Debt | Senior Notes Purchase Agreement                  
Debt Instrument [Line Items]                  
Conversion of notes   $ 63.5              
Conversion of notes (in shares) | shares   9.2