Investment in Marketable Securities - Schedule of Net Loss on Marketable Securities Comprising of Realized and Unrealized Gains (Losses) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Realized (loss) gain on marketable securities, net	$ (3,000)	$ 530,000	$ (77,000)	$ 522,000
Unrealized loss on marketable securities, net	(50,000)	(2,475,000)	(491,000)	(2,664,000)
Unrealized loss on marketable securities related to Comstock	(66,000)	(26,000)	(370,000)	(462,000)
Net loss on marketable securities	$ (119,000)	$ (1,971,000)	$ (568,000)	$ (2,142,000)