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INCOME TAXES - Summary of Income Tax Contingencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Domestic $ (15,974) $ (66,402)
Foreign 0 0
Loss from continuing operations before income taxes $ (15,974) $ (66,402)