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Long-term Investments - Equity method investments (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Schedule Of Equity Method Investment [Roll Forward]        
Beginning balance     $ 16,654,000  
Addiition     0  
Income (loss) on investment     (8,000)  
Impairment loss $ 0 $ 0 0 $ 0
Foreign currency translation adjustments     0  
Ending balance 16,646,000   16,646,000  
BDCG        
Schedule Of Equity Method Investment [Roll Forward]        
Beginning balance     9,800,000  
Addiition     0  
Income (loss) on investment     0  
Impairment loss     0  
Foreign currency translation adjustments     0  
Ending balance 9,800,000   9,800,000  
Glory        
Schedule Of Equity Method Investment [Roll Forward]        
Beginning balance     6,854,000  
Addiition     0  
Income (loss) on investment     (8,000)  
Impairment loss     0  
Foreign currency translation adjustments     0  
Ending balance $ 6,846,000   $ 6,846,000