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EQUITY INCENTIVE PLANS - Unrecognized Compensation Cost (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized [Abstract]  
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount $ 2.8
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years