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Income tax (Schedule of Tax Effects of Temporary Differences that Give Rise to Deferred Tax Asset Balances) (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:        
Tax loss carried forward ¥ 148,899 ¥ 74,951    
Allowance for doubtful receivable, accrued expense and others not currently deductible for tax purposes 84,249 62,177    
Deferred revenue 36,007 97,858    
Impairment of investment 17,180 12,783    
Others 753 753    
Valuation allowance (175,793) [1] (135,505) [1] ¥ (80,712) ¥ (53,316)
Amounts offset by deferred tax liabilities (40,461) 0    
Total deferred tax assets, net 70,834 113,017    
Deferred tax liabilities:        
Related to the fair value changes of investments 61,658 3,627    
Related to acquired intangible assets 1,531 2,406    
Others 4,777 4,777    
Amounts offset by deferred tax assets (40,461) 0    
Total deferred tax liabilities, net ¥ 27,505 ¥ 10,810    
[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.