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RELATED PARTY TRANSACTIONS - Unvested Share Activity (Details) - Employee Stock Option - $ / shares
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Shares    
Granted (in shares) 0 0
Vested (in shares) 0 0
Outstanding Unvested Shares at End of Period (in shares) 4,500 4,500
Weighted Average Grant Date Fair Market Value    
Granted (in dollars per share) $ 0 $ 0
Vested (in dollars per share) 0 0
Outstanding Unvested Shares at End of Period (in dollars per share) $ 3.33 $ 3.40