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Equity - Preferred Stock (Details) - $ / shares
12 Months Ended
Jan. 11, 2019
Dec. 31, 2020
Sep. 30, 2021
Dec. 20, 2018
Dec. 18, 2018
Class of Stock [Line Items]          
Par value (in usd per share)   $ 0.001 $ 0.001    
Preferred shares authorized (in shares)   20,000,000 20,000,000    
Series A shares issued and outstanding          
Class of Stock [Line Items]          
Shares issued (in shares)   6,375 0    
Shares outstanding (in shares)   6,375 0    
Series A shares issued and outstanding | CGI          
Class of Stock [Line Items]          
Shares issued (in shares)       6,125 6,125
Series A shares issued and outstanding | CGI | Eliminated Segment          
Class of Stock [Line Items]          
Shares issued (in shares)   6,125      
Series A-2 shares issued and outstanding          
Class of Stock [Line Items]          
Shares issued (in shares)   4,000 0    
Shares outstanding (in shares)   4,000 0    
Series A-2 shares issued and outstanding | CGI          
Class of Stock [Line Items]          
Issuance of common stock (in shares) 10,000        
Series A-2 shares issued and outstanding | CGI | Eliminated Segment          
Class of Stock [Line Items]          
Issuance of common stock (in shares)   10,000      
Series A- 3 Preferred Stock          
Class of Stock [Line Items]          
Shares issued (in shares)   0 6,125    
Shares outstanding (in shares)   0 6,125    
Series A- 4 Preferred Stock          
Class of Stock [Line Items]          
Shares issued (in shares)   0 10,000    
Shares outstanding (in shares)   0 10,000