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Stockholders' Equity (Narrative) (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 18, 2023
Dec. 15, 2021
Dec. 31, 2021
Nov. 30, 2021
Dec. 31, 2020
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]                        
Preferred Stock, Shares Authorized           20,000,000            
Preferred Stock, Shares Issued                       104,574
Common Stock, Shares, Issued           15,675,634            
Conversion of Stock, Shares Converted           0            
Preferred Stock Retired, Liquidation Preference               $ 5,000,198        
Conversion of Stock, Share Price     21.62         21.62        
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 21.62           $ 21.62          
Payments for Repurchase of Preferred Stock and Preference Stock   $ 1,100,000 $ 43,300,000 $ 42,200,000 $ 60,000,000 $ 0 $ 0 $ 44,400,000        
Operating Loss Carryforwards                     $ 568,000,000.0  
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           $ 23,200,000 $ 4,000,000.0 $ 42,100,000        
Stock Repurchase Price per Share     $ 1,149.99                  
Preferred Stock, Liquidation Amount per Share     $ 1,291.04         $ 1,291.04 $ 1,347.29      
Common Class A [Member]                        
Class of Stock [Line Items]                        
Common Stock, Shares Authorized           70,000,000            
Common Stock, Par or Stated Value Per Share           $ 0.10            
Common Stock, Shares, Issued           14,956,434 13,919,646          
Stock Issued During Period, Shares, New Issues           722,568 99,090 1,516,467        
Stock Issued During Period, Value, Gross           $ 24,400,000 $ 3,800,000 $ 44,200,000        
Stock Issued During Period, Value, Net           23,400,000 3,600,000 42,400,000        
Direct Costs of Stock Issuance           $ 200,000   $ (300,000)        
Conversion of Stock, Shares Converted 149,179     231,276       231,276        
Common Class B [Member]                        
Class of Stock [Line Items]                        
Common Stock, Shares Authorized           30,000,000            
Common Stock, Par or Stated Value Per Share           $ 0.10            
Common Stock, Shares, Issued           719,200            
Preferred Series B [Member]                        
Class of Stock [Line Items]                        
Preferred Stock, Liquidation Preference Per Share                   $ 1,000    
Preferred stock           $ 0 $ 0          
Direct Costs of Stock Issuance               $ 900,000        
Conversion of Stock, Shares Converted               3,873        
Stock Repurchased and Retired During Period, Shares               37,847        
Preferred Stock, Shares Outstanding     0   41,720 0 0 0        
Warrant [Member]                        
Class of Stock [Line Items]                        
Conversion of Stock, Shares Converted 250,000             250,000