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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Share-based compensation (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Share-based compensation expense $ 1,157,236 $ 2,503,152
General and administrative    
Share-based compensation expense $ 1,157,236 $ 2,503,152