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Income Taxes - Composition of income tax (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Composition of income tax |  |  |  |
Current income tax expense |  | ¥ 22,978 | ¥ 15,079 | ¥ 3,963
Deferred taxation | $ (443) | (3,085) | (252) | (54)
Total | $ 2,857 | ¥ 19,893 | ¥ 14,827 | ¥ 3,909

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