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INCOME TAX - Reconciliation of differences between PRC statutory income tax rate and effective income tax rate (Details)	12 Months Ended
	Dec. 31, 2023 CNY (¥)	Dec. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 CNY (¥)	Dec. 31, 2022 $ / shares	Dec. 31, 2021 CNY (¥)
Reconciliation of differences between PRC statutory income tax rate and effective income tax rate
Computed expected income tax expense (benefit)	¥ (71,077,803)		¥ (17,804,968)		¥ 68,214,254
Non-PRC entities not subject to income tax	2,820,038		6,581,327		4,244,821
Research and development expenses bonus deduction	(30,807,283)		(34,910,421)		(23,328,287)
Non-deductible share-based compensation expenses	11,742,974		13,866,734		11,015,406
Other non-deductible expenses	2,491,593		638,898		723,768
Preferential tax rate difference	7,301,540		(3,075,033)
Tax filing differences	229,108		(3,770,720)		2,682,378
Change in valuation allowance	67,106,949		16,717,239		(16,515,732)
Total	¥ (10,192,884)	$ (1,435,638)	¥ (21,756,944)		¥ 47,036,608
Effect of preferential tax rates on basic earnings per Class A and Class B ordinary share | $ / shares		$ (0.05)		$ 0.02
Effect of preferential tax rates on diluted earnings per Class A and Class B ordinary share | $ / shares		$ (0.05)		$ 0.02

X

- Definition

The amount of effect of preferential tax rates on basic earnings per Class A and Class B ordinary share.

+ References

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The amount of effect of preferential tax rates on diluted earnings per Class A and Class B ordinary share.

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- Definition

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to preferential tax rate difference.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit).

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other nondeductible expenses.

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Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense (benefit).

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to research tax credit.

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