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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accrued Expenses (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Accounting Policies [Abstract]    
Accrued compensation and benefits $ 1,203,218 $ 1,111,028
Accrued clinical expenses 4,571,106 4,042,277
Other accrued expenses 137,130 136,876
Total $ 5,911,454 $ 5,290,181