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FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cash | $ 6,337 |
Adjusted Cost | 77,897 |
Unrealized Gains(3) | 247 |
Fair Value | 78,144 |
Short-term Marketable Securities | 61,678 | $ 0
Cash and Cash Equivalents | 16,466 | $ 9,949
U.S. Treasury Securities, maturities less than three months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 10,129 |
U.S. Treasury Securities, maturities greater than three months |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Adjusted Cost | 61,431 |
Unrealized Gains(3) | 247 |
Fair Value | $ 61,678 |

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