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Taxation - Deferred tax assets and liabilities (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Advertising expense in excess of deduction limit | ¥ 20,871 | ¥ 43,262 |  |
Accrued expense and other payables | 13,422 | 6,615 |  |
Net operating tax loss carry forwards (Note) | 86,410 | 39,836 |  |
Total deferred tax assets | 120,703 | 89,713 |  |
Less: valuation allowance | (120,703) | (89,713) | ¥ (62,714) | ¥ (48,555)
Net deferred tax assets | 0 | ¥ 0 |  |
Identifiable intangible assets arising from acquisition | 5,451 |  |  |
Total deferred tax liabilities | ¥ 5,451 |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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