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Income Taxes - Deferred Tax Assets and Liabilities (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Deferred tax assets:            
Provision of allowance for doubtful accounts ¥ 31,240 $ 4,487 ¥ 21,431      
Accrued payroll and expenses and others 32,849 4,720 25,576      
Net operating loss carryforward 136,503 19,607 69,150      
Less: valuation allowance (126,904) (18,229) (55,997) $ (8,043) ¥ (14,208) ¥ (11,402)
Total deferred tax assets, net 73,688 10,585 60,160      
Deferred tax liabilities:            
Unrealized holding gain of available-for-sale debt investments* 190,830 27,412 132,272      
Amortizable intangible assets from acquisition of a subsidiary 5,668 814 7,376      
Others 1,312 188 1,312      
Total deferred tax liabilities 197,810 28,414 140,960      
Particle            
Deferred tax liabilities:            
Unrealized holding gain of available-for-sale debt investments* ¥ 190,800 $ 27,400 ¥ 132,300