Annual report pursuant to Section 13 and 15(d)

INCOME TAXES - Unrecognized Tax Benefits (Details)

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INCOME TAXES - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Balance as of January 1: $ 0 $ 0
Increase in current year positions 47 0
Increase in prior year positions 119 0
Decrease in prior year positions 0 0
Balance as of December 31: $ 166 $ 0