Concentrations and Risks (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Concentrations and Risks (Textual)
Allowance for doubtful accounts	$ 5,100		$ 5,100		$ 5,900
Concentration risk, description			For the wholesale business, the Company did not rely on any finished goods supplier that represented more than 10% of the total raw material purchases
Raw Material Suppliers One [Member]
Concentrations and Risks (Textual)
Concentration risk, percentage			32.00%	31.40%
Raw Material Supplier Two [Member]
Concentrations and Risks (Textual)
Concentration risk, percentage			31.00%	31.20%
Raw Material Supplier Three [Member]
Concentrations and Risks (Textual)
Concentration risk, percentage			21.00%
Revenues [Membe] | Wholesale Business One [Member]
Concentrations and Risks (Textual)
Concentration risk, percentage	8.00%	9.68%	16.00%	8.97%
Revenues [Membe] | Wholesale Business Two [Member]
Concentrations and Risks (Textual)
Concentration risk, percentage	14.00%	6.60%	10.00%