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Taxation - Income Tax Rates (Details) ¥ in Thousands, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 HKD ($) | Jan. 02, 2008 | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017
Income Tax Disclosure [Line Items] |  |  |  |  |
Statutory tax rate (as a percent) |  |  | 25.00% | 25.00% | 25.00%
Hong Kong |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Statutory tax rate (as a percent) |  |  | 16.50% |  |
Amount of assessable profits under lowered tax rate | $ | $ 2,000 |  |  |  |
Percentage of lowered income tax rate (as a percent) | 8.25% |  |  |  |
PRC |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Statutory tax rate (as a percent) |  |  | 25.00% |  |
Withholding Tax Rate |  | 10.00% |  |  |
Undistributed earnings | ¥ |  |  | ¥ 8,909 | ¥ 8,557 |
PRC | HNTE |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |
Preferential tax rate (as a percent) |  |  | 15.00% | 15.00% | 15.00%

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