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Concentrations and Risks (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenues earned in geographic areas    
Revenues $ 87,956 $ 92,785
Wholesale Business [Member]    
Revenues earned in geographic areas    
Revenues 28,102 25,256
Retail Business [Member]    
Revenues earned in geographic areas    
Revenues 59,854 67,529
Mainland China [Member]    
Revenues earned in geographic areas    
Revenues 10,754 4,211
Hong Kong China [Member]    
Revenues earned in geographic areas    
Revenues 1,253 5,138
Germany [Member]    
Revenues earned in geographic areas    
Revenues 850 1,866
United Kingdom    
Revenues earned in geographic areas    
Revenues 800 2,218
Europe Other [Member]    
Revenues earned in geographic areas    
Revenues 5,229 4,453
Japan [Member]    
Revenues earned in geographic areas    
Revenues 4,938 2,436
United States [Member]    
Revenues earned in geographic areas    
Revenues $ 4,278 $ 4,934