Concentrations and Risks (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues earned in geographic areas
Total	$ 109,926	$ 118,601	$ 282,295	$ 292,231
Mainland China [Member]
Revenues earned in geographic areas
Total	22,860	25,225	36,854	42,670
Hong Kong China [Member]
Revenues earned in geographic areas
Total	10,245	8,173	22,314	19,035
Germany [Member]
Revenues earned in geographic areas
Total	3,517	3,147	5,760	10,414
United Kingdom [Member]
Revenues earned in geographic areas
Total	6,149	6,811	12,568	13,792
Europe-Other [Member]
Revenues earned in geographic areas
Total	14,724	14,044	32,999	22,743
Japan [Member]
Revenues earned in geographic areas
Total	2,562	5,425	9,181	11,289
United States [Member]
Revenues earned in geographic areas
Total	8,816	8,495	19,554	14,443
Total wholesale business [Member]
Revenues earned in geographic areas
Total	68,873	71,320	139,230	134,386
Retail Business [Member]
Revenues earned in geographic areas
Total	$ 41,053	$ 47,281	$ 143,065	$ 157,845