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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Common stocks reflected in the condensed balance sheets (Details) - USD ($)
12 Months Ended 15 Months Ended
Jun. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Common stock subject to possible redemption   $ 143,086,271 $ 143,086,271 $ 93,929,920 $ 86,394,680 $ 80,397,819 $ 106,884,111
LifeSci Acquisition II Corp              
Gross proceeds $ 80,090,410 80,090,410          
Common stock issuance costs 1,858,498 (1,858,498)          
Accretion of carrying value to redemption value 1,858,498 1,858,498          
Common stock subject to possible redemption $ 80,090,410 $ 80,090,410