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COMMITMENTS AND CONTINGENCIES - Line of Credit Facility (Details) - Line of credit - HSBC China
$ in Millions
1 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2017
USD ($)
Feb. 28, 2017
USD ($)
Commitments and Contingencies      
Maximum borrowing capacity $ 4.0   $ 9.0
Accounts payable      
Commitments and Contingencies      
Amount outstanding   $ 1.1  
People's Bank of China      
Commitments and Contingencies      
Multiplier for calculating effective rate from benchmark rate 1.05