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INCOME TAXES - Earnings before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
U.S.  $ (54,085) $ (52,007) $ (76,052)
Foreign 2,146 2,207 820
Loss before income taxes $ (51,939) $ (49,800) $ (75,232)