Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Consolidated Statements of Comprehensive Income (loss) (Parenthetical)

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Consolidated Statements of Comprehensive Income (loss) (Parenthetical) - CNY (¥)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]      
Income tax on foreign currency translation adjustment ¥ 0 ¥ 0 ¥ 0