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STOCKHOLDERS' EQUITY - Common Stock Shares (Details)
Sep. 30, 2021
Vote
$ / shares
shares
Jun. 30, 2021
Vote
$ / shares
shares
Mar. 31, 2021
shares
Dec. 31, 2020
$ / shares
shares
Sep. 30, 2020
$ / shares
shares
Jun. 30, 2020
$ / shares
shares
Mar. 31, 2020
shares
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2018
shares
Class of Stock [Line Items]                  
Common shares, shares authorized (in shares) 74,666,115     74,666,115       61,057,864  
Common shares, par value (in dollars per share) | $ / shares $ 0.0001     $ 0.0001 $ 0.0001     $ 0.0001  
Common shares, shares issued (in shares) 4,595,168     2,765,097       8,396,425  
Common shares, shares outstanding (in shares) 4,595,168   4,488,416 2,765,097 8,544,436   8,468,742 8,396,425 8,273,865
Class A common stock subject to possible redemption, issued (in shares) 41,587,368     41,587,368       32,653,742  
Common stock subject to possible redemption 41,587,368     41,587,368 41,692,230     32,653,742  
LifeSci Acquisition II Corp                  
Class of Stock [Line Items]                  
Common shares, shares authorized (in shares) 30,000,000 30,000,000       30,000,000      
Common shares, par value (in dollars per share) | $ / shares $ 0.0001 $ 0.0001       $ 0.0001      
Common shares, votes per share | Vote 1 1              
Common shares, shares issued (in shares) 2,002,260 2,002,260       2,156,250      
Common shares, shares outstanding (in shares) 2,002,260 2,002,260       2,156,250      
Common stock subject to possible redemption 8,009,041 8,009,041              
Common stock subject to redemption | LifeSci Acquisition II Corp                  
Class of Stock [Line Items]                  
Class A common stock subject to possible redemption, issued (in shares)   8,009,041       0      
Common stock subject to possible redemption 8,009,041 8,009,041       0