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Prepayments and other current assets - Schedule of Prepayments and Other Assets (Parenthetical) (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Proceed Receivable $ 1,105,000
Employees [Member] | Minimum  
Loans Receivables Term 8 years
Employees [Member] | Maximum  
Loans Receivables Term 10 years
Shenzhen Arashi  
Proceed Receivable $ 1,105,000