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)
9 Months Ended 12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
USD ($)
Jan. 01, 2018
CNY (¥)
Revenue recognition              
Retained earnings   ¥ (200,151,065)   ¥ (71,888,585)   $ (28,749,902)  
Net revenues ¥ 5,185,822 97,770,167 $ 14,043,806 1,338,592 ¥ 7,389,371    
Rental income              
Revenue recognition              
Net revenues ¥ 4,041,142            
Other revenue - licensing fees from authorized test centers              
Revenue recognition              
Licensing period (in years)         10 years    
Test development services | Minimum              
Revenue recognition              
Period for development of tests         2 months    
Test development services | Maximum              
Revenue recognition              
Period for development of tests         6 months    
ASU 2014-09 | Adjustment              
Revenue recognition              
Retained earnings             ¥ 0
ASU 2014-09 | Adjustment | Rental income | Other operating income, net              
Revenue recognition              
Net revenues   1,580,270   5,943,984      
ASU 2014-09 | Not adopted ASC 606              
Revenue recognition              
Net revenues   ¥ 1,580,270   ¥ 5,943,984