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SHAREHOLDERS' EQUITY - Common Stock - Shares (Details) - $ / shares
Dec. 31, 2017
Dec. 31, 2016
Common Stock    
Common stock shares authorized 100,000,000 100,000,000
Common stock par value (in dollars per share) $ 0.001 $ 0.001
Common stock shares issued 27,718,802 21,964,282
Common stock shares outstanding 27,718,802 21,964,282
Common Stock    
Common Stock    
Common stock shares authorized 100,000,000 100,000,000
Common stock par value (in dollars per share) $ 0.001 $ 0.001
Common stock shares issued 27,718,802 21,964,282
Common stock shares outstanding 27,718,802 21,964,282