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v3.20.1

Segment information (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue |  | $ 17,399 | $ 20,104 | $ 17,350
Geographical analysis of long-lived assets | [1] | 700 | 754 |
The PRC |  |  |  |
Revenue |  | 6,886 | 8,026 | 7,740
Geographical analysis of long-lived assets | [1] | 222 | 250 |
Hong Kong |  |  |  |
Revenue |  | 10,169 | 11,169 | 9,270
Geographical analysis of long-lived assets | [1] | 478 | 504 |
Others |  |  |  |
Revenue |  | $ 344 | $ 909 | $ 340
[1] | Long-lived assets represent property, plant and equipment, net.

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