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Stockholders' Equity (Narrative) (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 18, 2023
$ / shares
shares
Dec. 31, 2024
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
shares
Feb. 02, 2021
$ / shares
Class of Stock [Line Items]            
Preferred Stock, Shares Authorized   20,000,000        
Common Stock, Shares, Issued   16,765,116        
Conversion of Stock, Shares Converted   0        
Conversion of Stock, Share Price | $ / shares           21.62
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 21.62         $ 21.62
Operating Loss Carryforwards | $   $ 534.6        
Common Stock Ownership Enabling Preferred Stock Purchase Rights   4.99%        
Common Stock Ownership Enabling Preferred Stock Purchase Rights, Incremental   0.50%        
Stock issued during period | $   $ 55.2 $ 23.2 $ 4.0    
Common Class A [Member]            
Class of Stock [Line Items]            
Common Stock, Shares Authorized   70,000,000 70,000,000      
Common Stock, Par or Stated Value Per Share | $ / shares   $ 0.10 $ 0.10      
Common Stock, Shares, Issued   16,045,916 14,956,434      
Stock Issued During Period, Shares, New Issues   933,987 722,568 99,090    
Stock Issued During Period, Value, Gross | $   $ 56.7 $ 24.4 $ 3.8    
Stock Issued During Period, Value, Net | $   55.1 23.4 3.6    
Direct Costs of Stock Issuance | $   $ 0.3 $ 0.2 $ 0.0    
Conversion of Stock, Shares Converted 149,179   149,179   231,276  
Common Class B [Member]            
Class of Stock [Line Items]            
Common Stock, Shares Authorized   30,000,000 30,000,000      
Common Stock, Par or Stated Value Per Share | $ / shares   $ 0.10 $ 0.10      
Common Stock, Shares, Issued   719,200 719,200      
Preferred Series B [Member]            
Class of Stock [Line Items]            
Preferred stock | $   $ 0.0 $ 0.0      
Conversion of Stock, Shares Converted         3,873  
Warrant [Member]            
Class of Stock [Line Items]            
Conversion of Stock, Shares Converted 250,000       250,000