Quarterly report pursuant to Section 13 or 15(d)

Assets and Liabilities, at Fair Value - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Details)

v3.20.4
Assets and Liabilities, at Fair Value - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Jun. 30, 2020
Fair Value Disclosures [Abstract]    
Commemorative coin inventory, held at lower of cost or net realizable value $ 9 $ 17