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INCOME TAXES - Rollforward of valuation allowances of deferred tax assets (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Rollforward of valuation allowances of deferred tax assets  
Balance as of beginning of year $ 23,636
Additions of valuation allowance 546
Utilization of deferred tax assets (153)
Change in tax rate 1,025
Balance as of the end of the year $ 25,054