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Summary of significant accounting policies (Details 1)
 12 Months Ended
Dec. 31, 2017
Leasehold improvements [Member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Property and equipment estimated useful life 5 years
Vehicles [Member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Property and equipment estimated useful life 5 years
Office equipment and furniture [Member]  
Disclosure of detailed information about property, plant and equipment [line items]  
Property and equipment estimated useful life 3 years