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Leases - Future minimum lease payment under operating leaase (Details) - Dec. 31, 2019
¥ in Thousands, $ in Thousands
USD ($)
CNY (¥)
Leases    
2020 $ 1,617 ¥ 11,255
2021 831 5,786
2022 220 1,534
2023 72 499
2024 42 291
Total minimum commitments $ 2,782 ¥ 19,365