v3.26.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of credit risk (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
item
Dec. 31, 2024
USD ($)
item
Dec. 31, 2023
item
Concentration of risks      
Cash and cash equivalents $ 74,523,782 $ 85,194,502  
Concentration of credit risk | Cash and cash equivalents | Mainland of China      
Concentration of risks      
Cash and cash equivalents 8,327,345 3,020,953  
Concentration of credit risk | Cash and cash equivalents | Outside the mainland of China      
Concentration of risks      
Cash and cash equivalents $ 66,196,437 $ 82,173,549  
Concentration of suppliers | Research and development services purchased | One supplier      
Concentration of risks      
Number of major supplier | item 1 1 0
Concentration of suppliers | Research and development services purchased | Another supplier      
Concentration of risks      
Concentration risk percentage 17.40% 17.20% 10.00%