Concentrations (Tables)

12 Months Ended

Dec. 31, 2017

Concentrations [Abstract]

Summary of concentrations of purchase from suppliers

	Year Ended December 31,
Supplier	2017			2016
A		17	%		17	%
B		12	%		14	%
C		10	%		10	%
D		10	%			*

* Less than 10%.