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INCOME TAX EXPENSE - Income tax reconciliation (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
INCOME TAX EXPENSE      
Loss before income tax $ (79,512,792) $ (71,476,322) $ (42,397,279)
PRC statutory income tax rate 25.00% 25.00% 25.00%
Income tax credit computed at PRC statutory income tax rate $ (19,878,198) $ (17,869,081) $ (10,599,320)
Impact of PRC preferential income tax rate as qualified TASE 7,951,279 7,147,633 4,239,728
Difference in income tax rates of overseas entities 10,560,029 10,549,985 5,286,487
Research and development super-deduction (1,724,740) (569,016) (718,979)
Research and development tax credits (569,575)    
Nondeductible expenses 3,695 1,054 1,238
Foreign derived intangible income deduction (487,183)    
Changes in valuation allowance 4,517,358 2,277,418 $ 1,790,846
State tax 76,127 291,500  
Others (10,263) 127,880  
Income tax expense $ 459,055 $ 1,701,613