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RELATED PARTY TRANSACTIONS (Details) - USD ($)
1 Months Ended 12 Months Ended
Aug. 31, 2012
Apr. 30, 2012
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
MPM          
RELATED PARTY TRANSACTIONS          
Due to Related Parties     $ 0    
MPM | Consulting agreement          
RELATED PARTY TRANSACTIONS          
Expenses incurred by the entity     0 $ 100,000 $ 300,000
Member of board of directors          
RELATED PARTY TRANSACTIONS          
Due to Related Parties     0 100,000  
Member of board of directors | Consulting agreement          
RELATED PARTY TRANSACTIONS          
Number of shares that can be purchased under option (in shares) 70,000 20,000      
Exercise price of shares that can be purchased under option (in dollars per share) $ 16.67 $ 11.02      
Member of board of directors | Consulting agreement | Maximum          
RELATED PARTY TRANSACTIONS          
Expenses incurred by the entity     $ 0 $ 100,000 $ 100,000