Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Schedule of Related Party Receivable and Payables Balances (Details)

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Related Party Transactions - Schedule of Related Party Receivable and Payables Balances (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jun. 30, 2020
Related Party Transaction [Line Items]    
Receivables $ 5,279 $ 13,359
Payables 6,074 3,421
Stack's Bowers Galleries    
Related Party Transaction [Line Items]    
Receivables 325 7,981
Equity method investee    
Related Party Transaction [Line Items]    
Receivables 4,716 5,301
Payables 6,074 3,421
SilverTowne L.P.    
Related Party Transaction [Line Items]    
Receivables $ 238 $ 77