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Significant accounting policies (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Significant accounting policies (Details) [Line Items] |  |  |
Convience translation, description | the convenience of the readers and were calculated at the rate of US$1.00=RMB 6.525, representing the index rates stipulated by the Federal Reserve Bank of New York on 31 December 2020. |  |
Capitalized costs recognized | ¥ 59,014 | ¥ 87,635 | ¥ 87,126
Impairment losses | ¥ 27,591 |  |
Revenue recognition description | the completion of trial period/trial course but before the completion of 30% of total hours in the courses, the contract assets are set off against the financial liabilities from contracts with customers and recognition of revenue is recorded as a reduction of the related financial liabilities from contracts with customers, and non-refundable amounts of course fee are transferred from financial liabilities from contracts with customers to deferred revenue. After the completion of 30% of total hours in the courses, the remaining financial liabilities from contracts with customers are reclassified as deferred revenue in the consolidated balance sheet and the recognition of revenue is recorded as a reduction of the deferred revenue. |  |
Refund regarding | ¥ 2,000 |  |
Branding and marketing expense | 123,308 | 140,281 | 144,203
Grants receivable | 28,124 | 5,773 | 7,817
Employee Benefits and Share-based Compensation | ¥ 27,054 | ¥ 62,084 | ¥ 56,248
Statutory reserve, percentage | 10.00% |  |
Surplus fund, percentage | 50.00% |  |
Minimum [Member] |  |  |
Significant accounting policies (Details) [Line Items] |  |  |
Ownership, percentage | 20.00% |  |
leases term | 1 year |  |
Maximum [Member] |  |  |
Significant accounting policies (Details) [Line Items] |  |  |
Ownership, percentage | 50.00% |  |
leases term | 10 years |  |
Short-term [Member] |  |  |
Significant accounting policies (Details) [Line Items] |  |  |
Revenue recognition description | the Group offers refunds of the amount related to the course fee of the undelivered course hours after deducting 30% of it or certain amount of teaching service fee for each completed course level to customers who withdraw from a course, provided attended course hours are less than or equal to 30% of total hours in the courses at the time of withdrawal. No refund will be provided for customers attending more than 30% of total hours in the underlying courses. |  |
Generally [Member] |  |  |
Significant accounting policies (Details) [Line Items] |  |  |
Estimated useful lives | 5 years |  |
Software Development [Member] |  |  |
Significant accounting policies (Details) [Line Items] |  |  |
Estimated useful lives | 10 years |  |

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