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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]        
Cash and cash equivalents $ 254,454 $ 24,743 $ 11,008  
Restricted cash 102 102 87  
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Total $ 254,556 $ 24,845 $ 11,095 $ 13,002