v3.20.1

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 |  |  |

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