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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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