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Taxation - Deferred tax assets and liabilities - Components (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Taxation        
Net operating loss carry forward ¥ 71,588 ¥ 142,793    
Allowance for doubtful accounts 27,229 17,208    
Payroll and accrued expenses 2,898 2,148    
Deductible advertisement expenses 94 158    
Long-term equity investment impairment 2,400      
Total deferred tax assets 104,209 162,307    
Less: Valuation allowance (96,920) (153,840) ¥ (162,491) ¥ (159,143)
Deferred tax assets ¥ 7,289 ¥ 8,467