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Income Taxes - Summary of Reconciliation of Tax Expense Computed by Applying Statutory Income Tax Rate to Pre-Tax Loss (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Income Tax Disclosure [Abstract]        
Income tax benefit at PRC statutory rate ¥ (2,245,608) $ (326,610) ¥ (936,124) ¥ (765,234)
Effect of differing tax rates in different jurisdictions 172,111 25,033 (35,888) 5,248
Non-deductible expenses 380,327 55,316 171,784 69,065
Deemed income 0 0 0 230,891
Research and development super-deduction (40,466) (5,886) (10,746) (10,746)
Effect of PRC preferential tax rates and tax holiday 709,165 103,144 320,114 179,266
Other adjustments (51,451) (7,483) 10,393 17,025
Change in valuation allowance 1,154,723 167,947 472,902 287,573
Income tax expense/(benefit) ¥ 78,801 $ 11,461 ¥ (7,565) ¥ 13,088