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Investments (Narrative) (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
shares
Sep. 30, 2022
USD ($)
investment
shares
Sep. 30, 2023
USD ($)
shares
Sep. 30, 2022
USD ($)
investment
shares
Dec. 31, 2022
USD ($)
investment
shares
May 19, 2023
Apr. 12, 2022
USD ($)
Equity Securities [Line Items]                
Shares held | shares   1,000,000   1,000,000   1,100,000    
Equity securities   $ 26,000,000   $ 26,000,000   $ 58,400,000    
Shares issued in debt-for-equity exchange (in shares) | shares     500,000   2,800,000      
Aggregate purchase price     $ 22,300,000   $ 112,300,000      
Number of shares sold in transaction (in shares) | shares   0   52,393        
Gross unrealized gains   $ 500,000   $ 500,000   $ 600,000    
Investments in an unrealized loss position | investment     0   0 0    
Impairment losses       0   $ 0    
Income (loss) from equity method investment, net   90,000 $ (3,191,000) (9,665,000) $ (10,077,000)      
Management fees recognized   0 $ 0 0 1,500,000      
Equity method investments   99,400,000   99,400,000   $ 112,300,000    
Xyla, Inc.                
Equity Securities [Line Items]                
Payments to acquire equity securities without readily determinable fair value $ 25,000,000.0              
Equity securities without readily determinable fair value   $ 25,300,000   $ 25,300,000        
Related Party                
Equity Securities [Line Items]                
Shares held | shares   1,000,000   1,000,000   1,100,000    
OCV Management, LLC                
Equity Securities [Line Items]                
Maximum exposure of investment   $ 99,400,000   $ 99,400,000   $ 112,300,000    
OCV Management, LLC | Related Party                
Equity Securities [Line Items]                
Distribution from equity method investment       0 $ 0      
Corporate Debt Securities                
Equity Securities [Line Items]                
Debt securities, available-for-sale, coupon rate             6.00% 4.00%
Debt securities, available-for-sale               $ 15,000,000
Carrying value of investment   15,500,000   15,500,000   15,600,000    
Maximum exposure of investment   $ 15,500,000   $ 15,500,000   $ 15,600,000