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Investments and Notes Receivable (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Jun. 30, 2023
Apr. 30, 2023
Feb. 28, 2023
Dec. 31, 2022
Mar. 31, 2022
Schedule of Equity Method Investments [Line Items]              
Initial investment $ 5,782,000 $ 5,782,000       $ 0  
Total carrying value of the VIEs 20,962,000 20,962,000       12,953,000  
Saudi Arabian Industrial Investments Company              
Schedule of Equity Method Investments [Line Items]              
Initial investment       $ 3,065,000     $ 6,500,000
Escrow deposit       $ 3,435,000   3,435,000  
Ownership percentage         49.00%    
Theradaptive, Inc              
Schedule of Equity Method Investments [Line Items]              
Total carrying value of the VIEs     $ 8,000,000        
Ownership percentage     8.25%        
Investment impairment charge 0 0          
Theradaptive, Inc | Series A Preferred Stock | Preferred Stock              
Schedule of Equity Method Investments [Line Items]              
Ownership percentage     9.15%        
Entach Inc              
Schedule of Equity Method Investments [Line Items]              
Total carrying value of the VIEs 6,900,000 6,900,000       6,900,000 $ 10,000
Ownership percentage             26.60%
Investment impairment charge 0 0          
Fair value of investment             $ 9,670,000
Historical impairment charges $ 2,770,000 $ 2,770,000       $ 2,770,000  
Entach Inc | Warrant              
Schedule of Equity Method Investments [Line Items]              
Fair value of investment             $ 330,000