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STOCKHOLDERS' EQUITY (Details 4) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Stockholders Equity Details 4Abstract    
Stock-based compensation expense associated with restricted stock $ 1,177 $ 7,337
Stock-based compensation expense associated with option grants 705 0
Total $ 1,882 $ 7,337