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INCOME TAXES - Components of Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]    
Current state income tax expense $ 267 $ 45
Current foreign income tax expense 541 211
Deferred federal income tax expense 0 0
Total income tax expense $ 808 $ 256