Fair Value Measurements - Schedule of Fair Value Measurements on Non-recurring Basis (Details) - USD ($)	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020
Other non-marketable investments	$ 98,000		$ 278,000
Net loss	(62,000)
Level 3 [Member]
Other non-marketable investments	$ 98,000		$ 278,000