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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Accounting Standards Update (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Notes payable   $ 26,599
Additional paid-in capital $ 468,421 192,381
Accumulated deficit $ (138,387) (80,714)
Adjustments    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Notes payable   30,638
Additional paid-in capital   (31,075)
Accumulated deficit   (437)
As adjusted    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Notes payable   57,237
Additional paid-in capital   161,306
Accumulated deficit   $ 80,277