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TRADE ACCOUNTS RECEIVABLE, NET - Summary of Movement of allowance for doubtful accounts (Details) - Third Party. |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 CNY (¥) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Jun. 30, 2020 CNY (¥) | Jun. 30, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Beginning balance |  |  |  | ¥ 5,849,504 |
Charge to (reversal of) credit losses |  | ¥ (2,647,068) | $ (416,113) | 3,730,606 |
Less: write-off |  | 0 | 0 | (254,853) |
Foreign currency translation adjustments | ¥ (9,830) | (49,826) | (7,833) |  |
Ending balance |  | ¥ 6,618,533 | $ 1,040,417 | ¥ 9,315,427 | $ 1,464,363

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