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INVESTMENT SECURITIES (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Amortized cost, as adjusted | $ 26,848 | $ 27,999
Gross unrealized holding gains | 2 | 0
Gross unrealized holding losses | 10 | 35
Estimated fair value | 26,840 | 27,964
Short-term Investments [Member] | US Government Agencies Debt Securities [Member] |  |
Amortized cost, as adjusted | 26,848 | 27,999
Gross unrealized holding gains | 2 | 0
Gross unrealized holding losses | 10 | 35
Estimated fair value | $ 26,840 | $ 27,964

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