Investment in Marketable Securities, Net - Schedule of Net Loss on Marketable Securities (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	$ (316,000)	$ (89,000)	$ (269,000)	$ 201,000
Unrealized (loss) gain on marketable securities, net	(140,000)	156,000	(284,000)	(531,000)
Unrealized (loss) gain on marketable securities related to Comstock	(20,000)	207,000	(293,000)	(134,000)
Net (loss) gain on marketable securities	$ (476,000)	$ 274,000	$ (846,000)	$ (464,000)