Concentrations of credit risk (Details)	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Concentrations of credit risk Details
Two customers of gross revenue	64.00%	35.00%
Two customers who comprised of gross revenue	54.00%	20.00%
Company's gross revenue for the periods ended	14.10%	38.10%
Major Vendors
One vendor purchased of merchandise	97.00%	50.00%
One vendors which it purchased of merchandise		35.00%