Concentrations and Risks (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Company's revenues as per geographic areas
Net revenue	$ 75,726,998	$ 85,667,780	$ 173,629,960	$ 191,682,949
Wholesale Business [Member]
Company's revenues as per geographic areas
Net revenue	29,792,039	36,394,581	63,065,965	75,836,070
Retail business [Member]
Company's revenues as per geographic areas
Net revenue	45,934,959	49,273,199	110,563,995	115,846,879
The People's Republic of China [Member]
Company's revenues as per geographic areas
Net revenue	9,373,554	12,929,219	28,307,488	27,527,244
Germany [Member]
Company's revenues as per geographic areas
Net revenue	2,780,201	5,525,792	7,267,170	11,823,952
United Kingdom [Member]
Company's revenues as per geographic areas
Net revenue	3,828,237	9,018,214	6,980,716	11,642,361
Europe-Other [Member]
Company's revenues as per geographic areas
Net revenue	6,897,024	2,061,398	8,698,730	8,517,320
Japan [Member]
Company's revenues as per geographic areas
Net revenue	2,933,661	2,431,821	5,863,864	8,674,713
United States [Member]
Company's revenues as per geographic areas
Net revenue	$ 3,979,362	$ 4,428,137	$ 5,947,997	$ 7,650,480