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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Changes in AOCI, including the Amounts Reclassified to Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Changes in AOCI, including the amounts reclassified to income    
Balance $ 77,401 $ 99,188
Less: Gain reclassified from AOCI to income (6)  
Balance 68,351 77,401
AOCI Including Portion Attributable to Noncontrolling Interest    
Changes in AOCI, including the amounts reclassified to income    
Balance 63,661 62,101
Balance 59,935 63,661
Foreign currency translation    
Changes in AOCI, including the amounts reclassified to income    
Unrecognized gain (loss) on foreign currency translation $ (3,720) $ 1,560