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STOCKHOLDERS' EQUITY (Stock-Based Compensation) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Equity [Abstract]        
Noncash compensation expense $ 193 $ 172 $ 809 $ 516