Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Pandora (Details)

v3.8.0.1
Related Party Transactions - Pandora (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 22, 2017
USD ($)
director
$ / shares
shares
Dec. 31, 2020
trading_days
$ / shares
Dec. 31, 2017
director
Sep. 30, 2017
USD ($)
$ / shares
Sep. 30, 2017
USD ($)
$ / shares
Sep. 30, 2016
USD ($)
Jun. 09, 2022
Sep. 22, 2020
Dec. 31, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]                  
Investment in convertible preferred stock         $ 480,000 $ 0      
Preferred stock, par value (in dollars per share) | $ / shares       $ 0.001 $ 0.001        
Pandora                  
Schedule of Equity Method Investments [Line Items]                  
Fair value of investment       $ 552,245 $ 552,245       $ 0
Pandora | Level 2                  
Schedule of Equity Method Investments [Line Items]                  
Fair value of investment       552,245 552,245       $ 0
Pandora | Series A Preferred Stock                  
Schedule of Equity Method Investments [Line Items]                  
Number of shares issued (in shares) | shares 480,000                
Investee | Pandora                  
Schedule of Equity Method Investments [Line Items]                  
Investment in convertible preferred stock $ 480,000       480,000        
Investment ownership percentage 19.00%                
Ownership percentage on an as-converted basis 16.00%                
Dividend income from investment       2,991 3,595        
Unrealized gain on investment       $ 68,650 $ 68,650        
Number of directors designated | director 3                
Number of directors designated as chairman | director 1                
Investee | Pandora | Forecast                  
Schedule of Equity Method Investments [Line Items]                  
Number of directors designated | director     2            
Minimum ownership percentage for director designation     50.00%            
Minimum ownership percentage for designation of two directors     75.00%            
Investee | Pandora | Series A Preferred Stock                  
Schedule of Equity Method Investments [Line Items]                  
Preferred stock, par value (in dollars per share) | $ / shares $ 0.0001                
Price per share (in dollars per share) | $ / shares $ 10.50                
Common shares issued upon conversion (in shares) | shares 95.2381                
Preferred stock dividend rate, percentage 6.00%                
Percentage of liquidation preference 100.00%                
Investee | Pandora | Series A Preferred Stock | Forecast                  
Schedule of Equity Method Investments [Line Items]                  
Percentage of liquidation preference             100.00% 100.00%  
Convertible preferred stock, stock trigger price (in dollars per share) | $ / shares   $ 18.375              
Convertible preferred stock, threshold trading days | trading_days   20              
Convertible preferred stock, threshold consecutive trading days | trading_days   30