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SHORT-TERM BANK LOANS - Additional information (Details) |  |  |  |  |  |  |  | 6 Months Ended |
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Jun. 21, 2021 CNY (¥) | Apr. 23, 2021 CNY (¥) | Apr. 23, 2021 USD ($) | Jul. 10, 2020 CNY (¥) | Jun. 23, 2020 CNY (¥) | Jun. 01, 2020 CNY (¥) | May 18, 2020 CNY (¥) | May 18, 2020 USD ($) | Apr. 15, 2020 CNY (¥) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Apr. 15, 2020 USD ($)
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 4.35% | 4.35% |  |
Proceeds from debt |  |  |  |  |  |  |  |  |  | ¥ 0 | $ 0 | ¥ 3,520,000 |
Interest Expense on Bank Loan |  |  |  |  |  |  |  |  |  | ¥ 262,259 | $ 41,226 | ¥ 296,912 |
Bank of Nanjing |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt | ¥ 2,500,000 |  |  |  | ¥ 1,500,000 |  |  |  |  |  |  |  |
Term of debt | 1 year |  |  |  | 1 year |  |  |  |  |  |  |  |
Proceeds from debt |  |  |  |  |  | ¥ 1,500,000 |  |  |  |  |  |  |
Beijing Rural Commercial Bank |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  | ¥ 10,000,000 |  |  |  | $ 1,571,977
Term of debt |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 4.60% |  |  |  | 4.60%
Proceeds from debt |  | ¥ 5,600,000 | $ 880,307 |  |  |  | ¥ 4,400,000 | $ 691,670 |  |  |  |  |
Carrying value of self-owned housing property pledged as collateral |  |  |  |  |  |  |  |  | ¥ 17,600,000 |  |  |  | $ 2,800,000
China Construction Bank |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  | ¥ 1,000,000,000,000 |  |  |  |  |  |  |  |  |
Term of debt |  |  |  | 1 year |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 4.0525% |  |  |  |  |  |  |  |  |

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