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INVESTMENTS (Details) - USD ($)
$ in Thousands
2 Months Ended 3 Months Ended 9 Months Ended
Dec. 09, 2020
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Short-term Investments [Abstract]          
Short-term deposits, carrying amount   $ 7,374 $ 30,324 $ 7,374  
Medium term notes, carrying amount   6,712 0 6,712  
Allowance for credit loss held to maturity, current   0   0 $ 0
Available-for-sale investment   28,234 72,000 28,234  
Allowance for credit loss available for sale investment, current   0   0 0
Net unrealized fair value gain (loss), current   4   4 0
Long-term Investments [Abstract]          
Long-term time deposits   0 216 0  
Sovereign bonds   64,455 0 64,455  
Allowance for credit loss held to maturity, non-current   0   0 0
Long-term available-for-sale investments   42,582 56,418 42,582  
Allowance for credit loss available for sale investment, non-current   13,429   13,429 0
Net unrealized fair value gain (loss), non-current   5,282   5,282 16,580
Equity Securities [Abstract]          
Equity security   19,038 21,665 19,038  
Impairment loss on equity security   6,845     0
Movement of Equity Investments [Roll Forward]          
Beginning balance $ 93,063   30,879 35,498 26,309
Additions     5,365 10,932 8,422
Retained interest in a former subsidiary       49,782  
Share of results     (681) (660) (2,558)
Share of other comprehensive income (loss)     175 313 (490)
Distribution from investment     (172) (791) (281)
Disposal         (523)
Impairment     (68) (2,011)  
Ending balance   93,063 35,498 93,063 $ 30,879
Subsequent Event [Member]          
Long-term Investments [Abstract]          
Write off of long term available-for-sale investments $ 37,571        
Fair Value, Inputs, Level 1 [Member]          
Short-term Investments [Abstract]          
Medium-term notes, fair value   6,712 0 6,712  
Long-term Investments [Abstract]          
Sovereign bonds, fair value   $ 64,313 $ 0 $ 64,313