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Commitments and Contingencies - Future minimum lease commitments (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Commitments and Contingencies    
Rent expense ¥ 17,878 ¥ 18,564
2020 10,189  
2021 6,190  
2022 4,942  
2023 4,807  
2024 722  
Thereafter 115  
Total ¥ 26,965