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ORGANIZATION - Components of Current Liquidity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Cash and cash equivalents $ 63,892 $ 33,417  
Debt securities available for sale 98,592 167,365  
Unrestricted liquidity 162,484 200,782  
Less: Other Ironton set-aside 54,560 50,713  
Available unrestricted liquidity 107,924 150,069  
Restricted Cash (current and non-current) 163,631 230,441  
Working capital 197,916 306,890  
Accumulated deficit (242,525) (157,779)  
Net loss $ (84,746) $ (77,502) $ (52,992)