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TAXATION - Reconciliation of tax (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
TAXATION        
Statutory income tax rate (as a percent) 25.00% 25.00% 25.00% 25.00%
(Loss)/income before income taxes ¥ 622,517 $ 97,687 ¥ (6,240,791) ¥ (3,159,120)
Income tax benefit computed at PRC statutory income tax rate of 25% (155,629) (24,422) 1,560,198 789,780
Additional deduction for R&D expenses 11,095 1,741 9,108 4,192
Non-deductible share-based compensation expenses (58,581) (9,193) (5,507) (38,071)
Non-deductible expenses and non-taxable income 17,516 2,750 (24,495) (43,651)
Change of valuation allowance (60,352) (9,471) (164,850) (535,424)
Effect of preferential tax rate 158,362 24,850 (9,395) (181,304)
Effect of International tax rates 155,242 24,361 (727,446) 3,091
Prior-year tax filing difference (3,792) (595) 188  
Income tax (expenses)/benefits ¥ 63,861 $ 10,021 ¥ 637,801 ¥ (1,387)