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Stockholders' Equity (Narrative) (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 06, 2022
USD ($)
Dec. 15, 2021
USD ($)
Sep. 01, 2020
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Nov. 30, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Sep. 30, 2021
$ / shares
Sep. 30, 2020
$ / shares
Dec. 31, 2019
shares
Dec. 31, 2017
USD ($)
shares
Class of Stock [Line Items]                          
Preferred Stock, Shares Authorized             20,000,000            
Preferred Stock, Shares Issued                         104,574
Common Stock, Shares, Issued             14,638,846            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized               700,000          
Conversion of Stock, Shares Converted             0            
Preferred Stock Retired, Liquidation Preference | $               $ 5,000,198          
Conversion of Stock, Share Price | $ / shares       21.62       21.62          
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares       $ 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 $ 44,400,000 $ 61,600,000        
Operating Loss Carryforwards | $                         $ 649,100,000
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 | $             $ 4,000,000.0 $ 42,100,000 $ 23,100,000        
Stock Repurchase Price per Share | $ / shares       $ 1,149.99                  
Preferred Stock, Liquidation Amount per Share | $ / shares           $ 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 | $ / shares             $ 0.10            
Common Stock, Shares, Issued       13,649,933     13,919,646 13,649,933          
Stock Issued During Period, Shares, New Issues     2,537,500       99,090 1,516,467          
Stock Issued During Period, Value, Gross | $ $ 24,000,000           $ 3,800,000 $ 44,200,000          
Stock Issued During Period, Value, Net | $             3,600,000 $ 42,400,000          
Direct Costs of Stock Issuance | $             $ (300,000)            
Conversion of Stock, Shares Converted         231,276     231,276 398,262        
Sale of Stock, Price Per Share | $ / shares           $ 10.00     $ 10.00        
Gross Proceeds from Issuance of Common Stock | $                 $ 25,400,000        
Payments of Stock Issuance Costs | $                 $ 2,300,000        
Common Class B [Member]                          
Class of Stock [Line Items]                          
Common Stock, Shares Authorized             30,000,000            
Common Stock, Par or Stated Value Per Share | $ / shares             $ 0.10            
Common Stock, Shares, Issued             719,200            
Conversion of Stock, Shares Converted                 (398,262)        
Preferred Series B [Member]                          
Class of Stock [Line Items]                          
Preferred Stock, Liquidation Preference Per Share | $ / shares                     $ 1,000    
Direct Costs of Stock Issuance | $               $ 900,000          
Conversion of Stock, Shares Converted               3,873          
Stock Repurchased and Retired During Period, Shares               37,847 62,854        
Preferred Stock, Shares Outstanding       0   41,720 0 0 41,720     104,574  
Warrant [Member]                          
Class of Stock [Line Items]                          
Conversion of Stock, Shares Converted               250,000