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Taxation (Details 2) ¥ in Thousands, $ in Thousands | Dec. 31, 2018 CNY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
--- | --- | --- | --- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |  |  |  |
Advertising expense in excess of deduction limit | ¥ 25,473 |  | ¥ 385 |  |  |  |
Accrued expense and other payables | 5,303 |  | 5,946 |  |  |  |
Net operating tax loss carry forwards | 31,938 |  | 42,224 |  |  |  |
Total deferred tax assets | 62,714 |  | 48,555 |  |  |  |
Less: valuation allowance | (62,714) | $ (62,714) | (48,555) | $ (48,555) | ¥ (39,613) | $ (39,613) | $ (32,914)
Net deferred tax assets | ¥ 0 |  | ¥ 0 |  |  |  |

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