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INCOME TAX - Net operating losses (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating losses carry forwards        
Deferred tax assets ¥ 146,088 ¥ 72,931    
Valuation allowance on deferred tax assets 328,821 ¥ 205,976 ¥ 155,852 ¥ 152,241
Deferred tax assets for net operating losses 386,999      
Valuation allowance on net operating losses carryforwards ¥ 251,868      
PRC enterprise income tax rate 25.00% 25.00% 25.00%  
State administration of taxation, China        
Operating losses carry forwards        
Net operating losses carry forwards ¥ 1,421,451      
Net operating losses carry forwards expire if unused by December 31, 2021 42,278      
Net operating losses carry forwards expire if unused by December 31, 2022 97,573      
Net operating losses carry forwards expire if unused by December 31, 2023 299,356      
Net operating losses carry forwards expire if unused by December 31, 2024 375,780      
Net operating losses carry forwards expire if unused by December 31, 2025 ¥ 606,464      
PRC enterprise income tax rate 25.00%      
Withholding tax for dividends distributed by a PRC-resident enterprise to its non-PRC-resident corporate investor (as a percent) 10.00%