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MARKETABLE SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 100,401 | $ 74,260
Gross Unrealized Losses | (96) | (59)
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 54,747 | 44,429
Gross Unrealized Losses | (88) | (50)
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 2,328 | 870
Gross Unrealized Losses | 0 | 0
U.S. Government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 24,762 | 9,951
Gross Unrealized Losses | (8) | (7)
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 18,564 | 19,010
Gross Unrealized Losses | $ 0 | $ (2)

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