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COMMITMENTS AND CONTINGENCIES - Line of Credit Facility (Details) - Line of credit - HSBC China - USD ($)
$ in Millions
Jun. 30, 2018
Feb. 28, 2018
Dec. 31, 2017
Commitments and Contingencies      
Maximum borrowing capacity   $ 15.0 $ 9.0
Accounts payable      
Commitments and Contingencies      
Amount outstanding $ 11.2    
People's Bank of China      
Commitments and Contingencies      
Interest rate on borrowings 5.50%