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Income Taxes - Income tax rates (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income taxes |  |  |
Income tax rate | 25.00% | 25.00% | 25.00%
Hong Kong |  |  |
Income taxes |  |  |
Income tax rate | 16.50% |  |
PRC |  |  |
Income taxes |  |  |
Income tax rate | 25.00% |  |

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