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Significant accounting policies (Details) - Schedule of summarizes the effect on the consolidated balance sheet ¥ in Thousands, $ in Thousands | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) | May 31, 2019 CNY (¥) | Jan. 01, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
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Significant accounting policies (Details) - Schedule of summarizes the effect on the consolidated balance sheet [Line Items] |  |  |  |  |  |
Prepayment and other current assets |  |  |  |  | ¥ 94,149 |
Current operating lease liabilities | ¥ 131,151 | $ 20,100 | ¥ 142,155 | ¥ 15,320 | 99,706 |
Operating lease right-of-use assets | 322,559 | 49,434 | 484,225 | ¥ 15,320 | 397,490 |
Intangible assets, net |  |  |  |  | 30,599 |
Operating lease liabilities | 200,409 | $ 30,714 | ¥ 333,613 |  | ¥ 280,867 |
December 31, 2018 As previously reported [Member] |  |  |  |  |  |
Significant accounting policies (Details) - Schedule of summarizes the effect on the consolidated balance sheet [Line Items] |  |  |  |  |  |
Prepayment and other current assets |  |  |  |  |  | ¥ 104,761
Current operating lease liabilities |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  |
Intangible assets, net |  |  |  |  |  | 36,904
Operating lease liabilities |  |  |  |  |  |
Effect of the adoption of ASC 842 [Member] |  |  |  |  |  |
Significant accounting policies (Details) - Schedule of summarizes the effect on the consolidated balance sheet [Line Items] |  |  |  |  |  |
Prepayment and other current assets | (10,612) |  |  |  |  |
Current operating lease liabilities | 99,706 |  |  |  |  |
Operating lease right-of-use assets | 397,490 |  |  |  |  |
Intangible assets, net | (6,305) |  |  |  |  |
Operating lease liabilities | ¥ 280,867 |  |  |  |  |

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