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EMPLOYEE STOCK COMPENSATION - Summary of Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement [Abstract]      
Grant date fair value of options granted $ 0 $ 0 $ 0
Fair value of options vested 8 67 160
Total intrinsic value of options exercised 29 87 96
Cash received from options exercised $ 0 $ 0 $ 0
Weighted-average estimated fair value per share of options granted (in dollars per share) $ 0 $ 0 $ 0