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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Accounting Policies [Abstract]    
Contract assets $ 0 $ 0
Contract liabilities $ 0 $ 0
Revenue, payment terms, minimum 15 days  
Revenue, payment terms, maximum 60 days  
Revenue, payment due 90 days