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SUBSEQUENT EVENT - Additional Information (Detail)
¥ in Millions
1 Months Ended 9 Months Ended
Oct. 10, 2018
USD ($)
g
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Oct. 10, 2018
CNY (¥)
g
Sep. 30, 2018
g
Sep. 30, 2018
kg
Sep. 30, 2018
CNY (¥)
Sep. 30, 2018
Feb. 23, 2017
USD ($)
Subsequent Event [Line Items]                  
Long-term Debt $ 208,000,000 $ 166,000,000 $ 166,000,000 ¥ 1.4     ¥ 1,140.2   $ 145,596
Line of Credit Facility, Maximum Borrowing Capacity $ 145,600,000 $ 145,600,000 $ 145,600,000 ¥ 1.0     ¥ 1,000.0    
Debt Instrument, Term   1 month 18 months            
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 10.50%     10.50%       11.00%  
Gold Lease Outstanding 5,356     5,356 4,974 57,476      
Minimum [Member]                  
Subsequent Event [Line Items]                  
Debt Instrument, Term 12 months                
Maximum [Member]                  
Subsequent Event [Line Items]                  
Debt Instrument, Term 18 months