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FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Cash - As Restated | $ 2,237 |  | $ 6,467 |
Adjusted Cost |  |  | 78,027 |
Unrealized Gains |  |  | 247 |
Fair Value |  |  | 78,274 |
Cash and Cash Equivalents | 58,812 | $ 32,415 | 16,596 | $ 40,663
Short-term Marketable Securities | $ 0 | $ 40,885 | 61,678 | $ 55,480
U.S. Treasury Securities, maturities less than three months |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost |  |  | 10,129 |
Fair Value |  |  | 10,129 |
Cash and Cash Equivalents |  |  | 10,129 |
U.S. Treasury Securities, maturities greater than three months |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Adjusted Cost |  |  | 61,431 |
Unrealized Gains |  |  | 247 |
Fair Value |  |  | 61,678 |
Short-term Marketable Securities |  |  | $ 61,678 |

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