v3.26.1
INCOME TAX - Reconciliation of differences between PRC statutory income tax rate and effective income tax rate (Details)
12 Months Ended
Dec. 31, 2025
CNY (¥)
¥ / shares
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
¥ / shares
Dec. 31, 2023
CNY (¥)
¥ / shares
Reconciliation of differences between PRC statutory income tax rate and effective income tax rate (in amount)        
Expected taxation at PRC statutory tax rate ¥ (15,592,295)   ¥ (54,201,797) ¥ (71,077,803)
Tax effect of taxexempt entities and differing tax rates in different jurisdictions     105,035 2,820,038
Non-deductible share-based compensation expenses 6,691,566   5,850,869 11,742,974
Other non-deductible expenses 4,745,881   888,261 2,491,593
Research and development expenses bonus deduction (28,027,491)   (25,718,922) (30,807,283)
Preferential tax rate difference (338,266)   15,880,110 7,301,540
Others 2,026,356   1,116,269 229,108
Change in valuation allowance 6,688,725   32,473,625 67,106,949
Foreign tax effects 821,933      
Total ¥ (22,983,591) $ (3,286,610) ¥ (23,606,550) ¥ (10,192,884)
Tax Jurisdiction of Domicile [Extensible Enumeration] CHINA CHINA CHINA CHINA
Effect of preferential tax rates on basic earnings per Class A and Class B ordinary share | ¥ / shares ¥ 0   ¥ (0.1) ¥ (0.05)
Effect of preferential tax rates on diluted earnings per Class A and Class B ordinary share | ¥ / shares ¥ 0   ¥ (0.1) ¥ (0.05)
Reconciliation of differences between PRC statutory income tax rate and effective income tax rate (in percent)        
PRC statutory tax rate 25.00% 25.00%    
Share-based compensation expenses (10.70%) (10.70%)    
Other non-deductible expenses (7.60%) (7.60%)    
Tax incentives relating to R&D expenditures 44.90% 44.90%    
Preferential tax rate difference 0.50% 0.50%    
Other (3.20%) (3.20%)    
Change in valuation allowance (10.70%) (10.70%)    
Foreign tax effects (1.30%) (1.30%)    
Actual income tax benefit (in percent) 36.90% 36.90%