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Taxation - Deferred tax assets and liabilities - Components (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Taxation |  |  |  |
Net operating loss carry forward | ¥ 71,588 | ¥ 142,793 |  |
Allowance for doubtful accounts | 27,229 | 17,208 |  |
Payroll and accrued expenses | 2,898 | 2,148 |  |
Deductible advertisement expenses | 94 | 158 |  |
Long-term equity investment impairment | 2,400 |  |  |
Total deferred tax assets | 104,209 | 162,307 |  |
Less: Valuation allowance | (96,920) | (153,840) | ¥ (162,491) | ¥ (159,143)
Deferred tax assets | ¥ 7,289 | ¥ 8,467 |  |

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