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

Goodwill and Intangible Assets, Net - Summary of Company's Intangible Assets (Parenthetical) (Details)

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Goodwill and Intangible Assets, Net - Summary of Company's Intangible Assets (Parenthetical) (Details)
12 Months Ended
Dec. 31, 2020
CNY (¥)
item
grade
Dec. 31, 2020
USD ($)
item
grade
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Intangible assets        
Impairment loss relating to intangible assets and other non-current assets ¥ 3,120,425 $ 478,226 ¥ 8,932,439  
Education assessment caseware        
Intangible assets        
Number of subjects included | item 3 3    
Number of grades of junior and senior high school included | grade 6 6    
Impairment loss relating to intangible assets ¥ 3,120,425      
Software platform of Project Shuang Chuang        
Intangible assets        
Impairment loss relating to intangible assets and other non-current assets     ¥ 8,932,439 ¥ 0