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Segment information (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue	$ 13,357	$ 17,399	$ 20,104
Geographical analysis of long-lived assets	259	700	754
The PRC
Revenue	5,072	6,886	8,026
Geographical analysis of long-lived assets	212	222	250
Hong Kong
Revenue	8,024	10,169	11,169
Geographical analysis of long-lived assets	47	478	504
Others
Revenue	261	344	909
Geographical analysis of long-lived assets	$ 0	$ 0	$ 0

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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