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RELATED PARTY TRANSACTIONS - Unvested Share Activity (Details) - Employee Stock Option - $ / shares
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Shares    
Outstanding Unvested Shares at Beginning of Period (in shares) 4,500 4,500
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    
Outstanding Unvested Shares at Beginning of Period (in dollars per share) $ 3.40 $ 4.33
Granted (in dollars per share) 0.00 0
Vested (in dollars per share) 0.00 0.00
Outstanding Unvested Shares at End of Period (in dollars per share) $ 3.40 $ 4.33