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Summary of significant accounting policies (Details 3) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating income (loss) | $ 771 | $ (272) | $ (445)
Previously reported |  |  |
Operating income (loss) | $ 781 | $ (1,701) | $ (440)
Net income (loss) per ordinary share | $ 0.19 | $ 0.25 | $ (0.06)
Weighted average number of ordinary shares outstanding | 5,154,759 | 3,092,859 | 2,301,993
Weighted average number of ordinary shares outstanding diluted | 5,154,759 | 3,092,859 | 2,301,993
Net income (loss) per ordinary share diluted | $ 0.19 | $ 0.25 | $ (0.06)
Restatement |  |  |
Operating income (loss) | $ 771 | $ (272) | $ (445)
Net income (loss) per ordinary share | $ 0.13 | $ 0.10 | $ (0.02)
Weighted average number of ordinary shares outstanding | 7,732,132 | 7,732,132 | 7,732,132
Weighted average number of ordinary shares outstanding diluted | 7,732,132 | 7,732,132 | 7,732,132
Net income (loss) per ordinary share diluted | $ 0.13 | $ 0.10 | $ (0.02)

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