Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Additional Information (Details)

v3.20.4
Related Party Transactions - Additional Information (Details)
3 Months Ended 6 Months Ended
Sep. 19, 2019
USD ($)
Dec. 31, 2020
USD ($)
investment
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
investment
Dec. 31, 2019
USD ($)
Oct. 01, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 01, 2018
USD ($)
Sep. 19, 2017
USD ($)
Related Party Transaction [Line Items]                  
Number of investments | investment   4   4          
Carrying Value   $ 30,013,000   $ 30,013,000     $ 16,763,000    
Income (loss) from equity method investment   2,362,000 $ 102,000 6,488,000 $ 114,000        
Interest income   205,000 $ 47,000 564,000 $ 89,000        
Convertible Revolving Credit Facility                  
Related Party Transaction [Line Items]                  
Line of credit facility, maximum borrowing capacity $ 4,000,000                
Line of credit facility, interest rate 12.00%                
Line of credit facility, outstanding balance   $ 2,500,000   $ 2,500,000   $ 3,500,000 3,500,000    
March 1, 2018 Loan Agreement                  
Related Party Transaction [Line Items]                  
Maximum borrowing capacity available               $ 10,000,000  
Participation interest, percentage of net profits realized on sale               10.00%  
Equity method investee                  
Related Party Transaction [Line Items]                  
Number of investments | investment   4   4          
Stack's Bowers Galleries | September 19, 2017 Loan Agreement                  
Related Party Transaction [Line Items]                  
Maximum borrowing capacity available                 $ 5,300,000
Short term loan receivable   $ 100,000   $ 100,000     700,000    
Stack's Bowers Galleries | March 1, 2018 Loan Agreement                  
Related Party Transaction [Line Items]                  
Short term loan receivable   $ 0   $ 0     $ 8,000,000