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RELATED PARTY TRANSACTIONS - Unvested Share Activity (Details) - Employee Stock Option - $ / shares
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Shares    
Outstanding Unvested Shares at Beginning of Period (in shares) 4,500 15,500
Granted (in shares) 0 4,500
Vested (in shares) (4,500) (15,500)
Outstanding Unvested Shares at End of Period (in shares) 0 4,500
Weighted Average Grant Date Fair Market Value    
Outstanding Unvested Shares at Beginning of Period (in dollars per share) $ 5.97 $ 12.79
Granted (in dollars per share) 0.00 5.97
Vested (in dollars per share) 5.97 12.79
Outstanding Unvested Shares at End of Period (in dollars per share) $ 0.00 $ 5.97