Investment in Marketable Securities - Schedule of Net Loss on Marketable Securities Comprising of Realized and Unrealized Gains (Losses) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Realized (loss) gain on marketable securities, net	$ (1,113,000)	$ (169,000)	$ (1,190,000)	$ 353,000
Unrealized (loss) gain on marketable securities, net	(1,254,000)	850,000	(1,375,000)	(1,352,000)
Unrealized (loss) gain on marketable securities related to Comstock	(26,000)	280,000	(396,000)	(182,000)
Net loss on marketable securities	$ (2,393,000)	$ 961,000	$ (2,961,000)	$ (1,181,000)