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VALUATION RESERVES (Tables)
12 Months Ended
Dec. 31, 2021
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Summary of Valuation Allowance
The following table summarizes the activity in our valuation accounts during the fiscal years ended December 31, 2021 and 2020.
Balance atCharged toBalance at
BeginningCosts andDeductionsEnd
(in thousands)of PeriodExpensesand Otherof Period
Year Ended December 31, 2021
Allowance for Doubtful Accounts$10 $147 $39 $196 
Deferred tax assets-valuation allowance$187,722 $180 $(3,928)$183,974 
Year Ended December 31, 2020
Allowance for Doubtful Accounts$174 $34 $(198)$10 
Deferred tax assets-valuation allowance$187,481 $370 $(129)$187,722