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, 2021
Dec. 31, 2020
Dec. 31, 2019
Gross unrecognized tax benefits      
Balance at the beginning of the year $ 8,901 $ 8,358 $ 8,358
Increase related to current year tax positions 285 543 543
Balance at the end of the year 9,186 $ 8,901 $ 8,358
Tax positions subject to interest or penalties $ 0