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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounting Policies [Abstract]            
Change in valuation allowance, benefit $ 54,966 $ 248 $ 2,137 $ 61,317 $ 4,420 $ 1,613