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Principal Accounting Policies - Liquidity, Functional Currency and Foreign Currency Translation, Short-term Investments, Accounts Receivable, Capitalized Software Development Cost (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2020
CNY (¥)
$ / ¥
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2020
USD ($)
$ / ¥
Liquidity          
Net loss ¥ (1,343,630) $ (205,920) ¥ (729,382) ¥ (199,371)  
Net cash used in operating activities (1,313,115) $ (201,243) (120,461) 268,089  
Accumulated deficit ¥ (7,713,355)   (6,385,974)   $ (1,182,123)
Functional Currency and Foreign Currency Translation          
Exchange rate | $ / ¥ 6.5250       6.5250
Unamortized amount ¥ 111,697   223,340   $ 17,118
Maximum [Member]          
Functional Currency and Foreign Currency Translation          
Weighted average cost of capital 10.00% 10.00%      
Minimum [Member]          
Functional Currency and Foreign Currency Translation          
Weighted average cost of capital 2.00% 2.00%      
Software [Member]          
Functional Currency and Foreign Currency Translation          
Cost capitalized ¥ 756   56,927 75,443  
Amortization expense 90,684   ¥ 36,983 ¥ 14,699  
Unamortized amount ¥ 21,700