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Segment information (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenue |  | $ 17,350 | $ 22,478 | $ 18,302
Geographical analysis of long-lived assets | [1] | 734 | 771 |
The PRC |  |  |  |
Revenue |  | 7,740 | 10,604 | 9,327
Geographical analysis of long-lived assets | [1] | 274 | 291 |
Hong Kong |  |  |  |
Revenue |  | 9,270 | 11,687 | 8,726
Geographical analysis of long-lived assets | [1] | 460 | 480 |
Others |  |  |  |
Revenue |  | $ 340 | $ 187 | $ 249
[1] | Long-lived assets represent property, plant and equipment, net.

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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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