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COMMITMENTS AND CONTINGENCIES - Line of Credit Facility (Details) - Line of credit - USD ($)
$ in Millions
Sep. 30, 2018
Feb. 28, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   $ 15.0 $ 9.0
Interest rate (as a percent) 5.50%    
Amount outstanding $ 10.1