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STOCKHOLDERS' EQUITY - Restricted Stock Unit Activity (Details) - Restricted Stock Units (RSUs) - shares
1 Months Ended 3 Months Ended
Aug. 31, 2019
Jan. 31, 2019
Mar. 31, 2020
Restricted stock units issued at beginning of year     428,919
Granted     15,000
Forfeited/Cancelled (3,215) (3,000) (25,000)
Total Restricted stock units issued at end of year     418,919
Vested at March 31, 2020     253,794
Unvested restricted shares as of December 31, 2019     165,125