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Taxation - Operating losses carry forwards (Details)
¥ in Thousands
Dec. 31, 2019
CNY (¥)
Taxation  
Net operating losses carry forwards ¥ 284,029
Net operating losses carry forwards, expire in December 31, 2020, if unused 4,053
Net operating losses carry forwards, expire in December 31, 2021, if unused 73,599
Net operating losses carry forwards, expire in December 31, 2022, if unused 152,419
Net operating losses carry forwards, expire in December 31, 2023, if unused 45,659
Net operating losses carry forwards, expire in December 31, 2024, if unused ¥ 8,299