Investments (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Mar. 31, 2018	Jun. 30, 2017
Available-for-sale Debt Securities, Amortized Cost Basis	$ 13,674	$ 6,870
Available-for-sale Equity Securities, Amortized Cost Basis	2,880
Available-for-sale Securities, Amortized Cost Basis	16,554
Available-for-sale Debt Securities Gross Unrealized Gain	8	0
Available-for-sale Equity Securities, Gross Unrealized Gain	85
Available-for-sale Securities, Gross Unrealized Gain	93
Available-for-sale Debt Securities, Gross Unrealized Loss	(382)	0
Available-for-sale Equity Securities, Gross Unrealized Loss	(22)
Available-for-sale Securities, Gross Unrealized Loss	(404)
Available-for-sale Securities, Debt Securities	13,300	6,870
Available-for-sale Equity Securities, Gross Unrealized Loss	(2,943)	0
Available-for-sale Securities	16,243
Common Stock [Member]
Available-for-sale Equity Securities, Amortized Cost Basis	2,880
Available-for-sale Equity Securities, Gross Unrealized Gain	85
Available-for-sale Equity Securities, Gross Unrealized Loss	(22)
Available-for-sale Equity Securities, Gross Unrealized Loss	2,943
Commercial Paper [Member]
Available-for-sale Debt Securities, Amortized Cost Basis	7,824	6,870
Available-for-sale Debt Securities Gross Unrealized Gain	0	0
Available-for-sale Debt Securities, Gross Unrealized Loss	0	0
Available-for-sale Securities, Debt Securities	7,824	$ 6,870
Corporate Debt Securities [Member]
Available-for-sale Debt Securities, Amortized Cost Basis	5,850
Available-for-sale Debt Securities Gross Unrealized Gain	8
Available-for-sale Debt Securities, Gross Unrealized Loss	(382)
Available-for-sale Securities, Debt Securities	$ 5,476

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Subparagraph (SX 210.5-02.2)
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