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Prepaid expenses (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Schedule of prepaid expenses    
Subtotal $ 4,409,073 $ 1,533,806
Less: long term prepaid expenses (2,472,186) (1,041,265)
Total 1,936,887 492,541
Cloud services [Member]    
Schedule of prepaid expenses    
Subtotal 3,086 7,083
Rental [Member]    
Schedule of prepaid expenses    
Subtotal 5,507
Platform [Member]    
Schedule of prepaid expenses    
Subtotal   15,839
Advertising [Member]    
Schedule of prepaid expenses    
Subtotal 834,515 1,024,000
Marketing and promotion [Member]    
Schedule of prepaid expenses    
Subtotal 2,024,084 486,251
Professional services [Member]    
Schedule of prepaid expenses    
Subtotal 1,541,666
Others [Member]    
Schedule of prepaid expenses    
Subtotal $ 215 $ 633