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

Summary of Significant Accounting Policies - Revenue Recognition - Additional Information (Details)

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Summary of Significant Accounting Policies - Revenue Recognition - Additional Information (Details)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Jan. 01, 2018
CNY (¥)
Revenue recognition        
Retained earnings ¥ (298,533,669) $ (45,752,286) ¥ (200,151,065)  
ASU 2014-09 | Adjustment        
Revenue recognition        
Retained earnings       ¥ 0