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FAIR VALUE MEASUREMENTS (Fair Value of Marketable Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Fair Value Measurements    
Estimated fair value of marketable securities $ 47,468 $ 52,456
Fair value, inputs, Level 1 [Member]    
Fair Value Measurements    
Estimated fair value of marketable securities $ 47,468 $ 52,456