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FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cash | $ 3,500 | $ 6,337
Adjusted Cost |  | 77,897
Unrealized Gains |  | 247
Fair Value |  | 78,144
Cash and cash equivalents | 67,360 | 16,466
Short-term Marketable Securities | 0 | 61,678
U.S. Treasury Securities, maturities less than three months |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | $ 63,900 | 10,129
Fair Value |  | 10,129
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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