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Income tax (Schedule of Tax Effects of Temporary Differences that Give Rise to Deferred Tax Asset Balances) (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CNY (¥)
--- | --- | --- | ---
Deferred tax assets: |  |  |  |
Allowance for doubtful accounts receivable, accrued expense and others not currently deductible for tax purposes |  | ¥ 65,721 |  | ¥ 83,503
Tax loss carried forward |  | 66,816 |  | 39,904
Deferred revenue |  | 57,284 |  | 48,244
Impairment of investment |  | 7,949 |  | 1,698
Others |  | 753 |  | 251
Valuation allowance | [1] | (80,712) |  | (53,316)
Total deferred tax assets, net |  | 117,811 | $ 16,969 | 120,284
Deferred tax liabilities: |  |  |  |
Related to acquired intangible assets |  | 3,281 |  | 16,817
Others |  | 4,777 |  |
Total deferred tax liabilities, net |  | ¥ 8,058 | $ 1,161 | ¥ 16,817
[1] | Valuation allowance is provided against deferred tax assets when the Group determines that it is more likely than not that the deferred tax assets will not be utilized in the future. In making such determination, the Group considered factors including future taxable income exclusive of reversing temporary differences and tax loss carry forwards. Valuation allowance was provided for net operating loss carry forward because it was more likely than not that such deferred tax assets would not be realized based on the Group’s estimate of its future taxable income. If events occur in the future that allow the Group to realize more of its deferred income tax than the presently recorded amounts, an adjustment to the valuation allowances will result in a decrease in tax expense when those events occur.

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