Geographic Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Geographic Information
Property and equipment, net	$ 1,946	$ 3,479
Revenue	42,031	37,503
Hong Kong
Geographic Information
Revenue	18,258	10,144
United States
Geographic Information
Property and equipment, net	1,415	2,235
Revenue	5,743	4,915
Japan
Geographic Information
Revenue	5,403	5,660
Canada
Geographic Information
Revenue	3,423	1,714
Germany
Geographic Information
Revenue	2,867	6,423
China
Geographic Information
Revenue	2,403	1,361
Singapore
Geographic Information
Property and equipment, net	287	789
All other
Geographic Information
Property and equipment, net	244	455
Revenue	$ 3,934	$ 7,286