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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accrued Expenses (Details) - USD ($)
Mar. 31, 2022
Dec. 31, 2021
Accounting Policies [Abstract]    
Accrued compensation and benefits $ 1,146,260 $ 1,633,295
Accrued clinical expenses 5,010,780 4,228,048
Other accrued expenses 98,893 106,479
Total $ 6,255,933 $ 5,967,822