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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Unrecognized tax benefits           $ 239,927 $ 239,927
Anti-dilutive securities attributable to warrants (in shares) 49,748,569 39,259,429 50,071,823 38,432,407   43,058,865 35,919,104
Exercise price of warrants $ 1.61   $ 1.61   $ 1.61 $ 1.61  
Sale of Private Placement Warrants (in shares) 6,439   6,439   6,439 6,439  
LifeSci Acquisition II Corp              
Unrecognized tax benefits $ 0 $ 0 $ 0 $ 0 $ 0    
Unrecognized tax benefits accrued for interest and penalties $ 0 $ 0 $ 0 $ 0 $ 0    
Anti-dilutive securities attributable to warrants (in shares)         3,146,454    
Shares subject to forfeiture 281,250   281,250   281,250    
Federal depository insurance coverage $ 250,000   $ 250,000   $ 250,000    
Offering Costs         $ 1,858,498