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Long-term Investments - Equity method investments (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Schedule Of Equity Method Investment [Roll Forward]    
Beginning balance $ 16,654,000 $ 16,956,000
Addition 2,600,000 19,992,000
Income (loss) on investment (48,000) (3,829,000)
Reclassification to subsidiaries 0 (3,124,000)
Impairment loss (16,650,000) (13,068,000)
Disposal   (245,000)
Foreign currency translation adjustments 0 (28,000)
Ending balance 2,556,000 16,654,000
Solectrac, Inc.    
Schedule Of Equity Method Investment [Roll Forward]    
Addition 2,600,000  
Income (loss) on investment (44,000)  
Reclassification to subsidiaries 0  
Impairment loss 0  
Foreign currency translation adjustments 0  
Ending balance 2,556,000  
Wecast Internet Limited ("Wecast Internet")    
Schedule Of Equity Method Investment [Roll Forward]    
Beginning balance   4,000
Addition   0
Income (loss) on investment   0
Impairment loss   (6,000)
Foreign currency translation adjustments   2,000
Hua Cheng    
Schedule Of Equity Method Investment [Roll Forward]    
Beginning balance   308,000
Addition   0
Income (loss) on investment   (33,000)
Impairment loss   0
Disposal   (245,000)
Foreign currency translation adjustments   (30,000)
BDCG    
Schedule Of Equity Method Investment [Roll Forward]    
Beginning balance [1] 9,800,000 9,800,000
Addition 0 0 [1]
Income (loss) on investment 0 0 [1]
Reclassification to subsidiaries 0  
Impairment loss (9,800,000) 0 [1]
Foreign currency translation adjustments 0 0 [1]
Ending balance 0 9,800,000 [1]
DBOT    
Schedule Of Equity Method Investment [Roll Forward]    
Beginning balance   6,844,000
Addition   0
Income (loss) on investment   (3,720,000)
Reclassification to subsidiaries   (3,124,000)
Impairment loss   0
Foreign currency translation adjustments   0
Glory    
Schedule Of Equity Method Investment [Roll Forward]    
Beginning balance [2] 6,854,000 0
Addition 0 19,992,000 [2]
Income (loss) on investment (4,000) (76,000) [2]
Reclassification to subsidiaries 0  
Impairment loss (6,850,000) (13,062,000) [2]
Foreign currency translation adjustments 0 0 [2]
Ending balance $ 0 $ 6,854,000 [2]
[1] BBD Digital Capital Group Ltd. (“BDCG”)
[2] Glory Connection Sdn. Bhd (“Glory”)