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MARKETABLE SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jun. 30, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 89,708 | $ 74,260
Gross Unrealized Losses | (30) | (59)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 47,474 | 44,429
Gross Unrealized Losses | (23) | (50)
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 6,478 | 870
Gross Unrealized Losses | (3) | 0
U.S. Government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 6,504 | 9,951
Gross Unrealized Losses | (3) | (7)
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 29,252 | 19,010
Gross Unrealized Losses | $ (1) | $ (2)

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