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FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cash | $ 5,774 |
Adjusted Cost | 96,096 |
Unrealized Gains | 47 |
Fair Value | 96,143 |
Short-term Marketable Securities | 55,480 | $ 0
Cash and cash equivalents | 40,663 | $ 9,949
U.S. Treasury Securities, maturities less than three months |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 34,889 |
Fair Value | 34,889 |
Cash equivalents | 34,889 |
U.S. Treasury Securities, maturities greater than three months |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 55,433 |
Unrealized Gains | 47 |
Fair Value | 55,480 |
Short-term Marketable Securities | $ 55,480 |

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