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INVESTMENT SECURITIES (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost, as adjusted | $ 20,573 | $ 27,999
Gross unrealized holding gains | 0 | 0
Gross unrealized holding losses | 17 | 35
Estimated fair value | 20,556 | 27,964
Short-term Investments [Member] | US Government Agencies Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized cost, as adjusted | 20,573 | 27,999
Gross unrealized holding gains | 0 | 0
Gross unrealized holding losses | 17 | 35
Estimated fair value | $ 20,556 | $ 27,964

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