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INVESTMENT SECURITIES (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Amortized cost, as adjusted $ 27,776 $ 26,943
Gross unrealized holding gains 35 2
Gross unrealized holding losses 3 10
Estimated fair value 27,808 26,935
Short-term Investments [Member] | US Government Agencies Debt Securities [Member]    
Amortized cost, as adjusted 27,776 26,943
Gross unrealized holding gains 35 2
Gross unrealized holding losses 3 10
Estimated fair value $ 27,808 $ 26,935