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Long-term equity investment (Details) ¥ in Thousands, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 05, 2018 CNY (¥) shares | Jul. 07, 2018 CNY (¥) shares | Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥)
Long-term equity Investments |  |  |  |  |
Impairment charges |  |  | ¥ 16,000 | $ 2,298 | ¥ 16,000
Haofangtong |  |  |  |  |
Long-term equity Investments |  |  |  |  |
Number Of Shares Purchased Equity Securities Without Readily Determinable Fair Value | 4,029,543 |  |  |  |
Ownership percentage acquired | 7.00% |  |  |  |
Percentage Ownership For Additional Shares That Can Be Purchased Equity Securities Without Readily Determinable Fair Value | 19 |  |  |  |
Consideration for purchase of financial instruments | ¥ | ¥ 56,000 |  |  |  |
Purchase Price Set For Additional Shares That Can Be Purchased Equity Securities Without Readily Determinable Fair Value | ¥ | ¥ 32,000 |  |  |  |
Haofangtong | Scenario, Plan [Member] |  |  |  |  |
Long-term equity Investments |  |  |  |  |
Expected Cumulative Percentage Ownership After All Transactions |  | 26.00% |  |  |
Number Of Shares Purchased Equity Securities Without Readily Determinable Fair Value |  | 4,029,543 |  |  |
Number Of Additional Shares That Can Be Purchased Equity Securities Without Readily Determinable Fair Value |  | 10,937,339 |  |  |
Ownership percentage acquired |  | 7.00% |  |  |
Percentage Ownership For Additional Shares That Can Be Purchased Equity Securities Without Readily Determinable Fair Value |  | 19 |  |  |
Consideration for purchase of financial instruments | ¥ |  | ¥ 56,000 |  |  |
Purchase Price Set For Additional Shares That Can Be Purchased Equity Securities Without Readily Determinable Fair Value | ¥ |  | ¥ 32,000 |  |  |

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