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STOCKHOLDERS' EQUITY - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) [Member] - shares
3 Months Ended 6 Months Ended
Mar. 31, 2018
Jun. 30, 2019
Restricted stock units issued as of December 31, 2018 222,514  
Granted 134,740  
Total Restricted stock units issued at March 31, 2019 357,254  
Vested at March 31, 2019   222,514
Unvested restricted stock units as of March 31, 2019   134,740