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Revenues and Deferred Revenue - Additional Information (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation Of Revenue [Abstract]      
Deferred revenue ¥ 3,228,770 ¥ 3,286,025 ¥ 2,110,428