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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Jun. 30, 2020
Marketable Securities [Line Items]
Adjusted Cost	$ 2,460
Available-for-sale, fair value, total	2,463
Level 3
Marketable Securities [Line Items]
Adjusted Cost	0	$ 0
Fair value, measurements, recurring
Marketable Securities [Line Items]
Adjusted Cost	2,460	2,484
Gross Unrealized Gains	4	9
Gross Unrealized Losses	(1)	0
Available-for-sale, fair value, total	2,463	2,493
Cash and Cash Equivalents	724	1,055
Short-Term Investments	1,013	925
Long-Term Investments	726	513
Fair value, measurements, recurring | Level 1
Marketable Securities [Line Items]
Adjusted Cost	724	1,055
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Available-for-sale, fair value, total	724	1,055
Cash and Cash Equivalents	724	1,055
Short-Term Investments	0	0
Long-Term Investments	0	0
Fair value, measurements, recurring | Level 2
Marketable Securities [Line Items]
Adjusted Cost	1,736	1,429
Gross Unrealized Gains	4	9
Gross Unrealized Losses	(1)	0
Available-for-sale, fair value, total	1,739	1,438
Cash and Cash Equivalents	0	0
Short-Term Investments	1,013	925
Long-Term Investments	726	513
Fair value, measurements, recurring | Money market funds | Level 1
Marketable Securities [Line Items]
Adjusted Cost	724	1,055
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Available-for-sale, fair value, total	724	1,055
Cash and Cash Equivalents	724	1,055
Short-Term Investments	0	0
Long-Term Investments	0	0
Fair value, measurements, recurring | Corporate securities | Level 2
Marketable Securities [Line Items]
Adjusted Cost	1,736	1,429
Gross Unrealized Gains	4	9
Gross Unrealized Losses	(1)	0
Available-for-sale, fair value, total	1,739	1,438
Cash and Cash Equivalents	0	0
Short-Term Investments	1,013	925
Long-Term Investments	$ 726	$ 513

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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