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Consolidated Statements of Comprehensive Income /(Loss) (Parenthetical) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Interest income from a related party $ 0 $ 810,000 $ 1,015,000
Interest expense from a related party 0 588,000 818,000
General and administrative from a related party 35,000 55,000 0
Brand advertising [Member]      
Revenues from a related party 173,000 227,000 174,000
Others [Member]      
Revenues from a related party 4,155,000 3,752,000 3,796,000
Cost of revenues from a related party $ 0 $ 0 $ 57,000