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RETIREMENT PLAN - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Retirement Benefits [Abstract]      
Defined contribution plan, vesting period 3 years    
Defined contribution plan, vesting percentage after 3 years 100.00%    
Defined contribution plan, employer matching contribution 50.00%    
Defined contribution plan, percent of employees' gross pay 3.00%    
Company matching contributions $ 0.3 $ 0.3 $ 0.3