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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, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Deferred tax assets:          
Tax loss carried forward   ¥ 707,744 ¥ 148,899    
Allowance for doubtful receivable, accrued expense and others not currently deductible for tax purposes   173,512 84,249    
Deferred revenue   90,959 36,007    
Impairment of investment   19,280 17,180    
Others   2,725 753    
Valuation allowance   (722,280) [1] (175,793) [1] ¥ (135,505) ¥ (80,712)
Amounts offset by deferred tax liabilities   (144,305) (40,461)    
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent, Total $ 18,334 127,635 70,834    
Deferred tax liabilities:          
Related to the fair value changes of investments   70,517 61,658    
Related to acquired intangible assets   323,466 1,531    
Others   14,961 4,777    
Amounts offset by deferred tax assets   (144,305) (40,461)    
Total deferred tax liabilities, net   ¥ 264,639 ¥ 27,505    
[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.