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DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Campus
State
Segment
School
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Business Activities [Abstract]        
Number of schools | School 22      
Number of states in which schools operate across the United States | State 14      
Number of campuses treated as destination schools | Campus 5      
Number of reportable segments | Segment 2      
Liquidity [Abstract]        
Cash, cash equivalents and restricted cash $ 26,742 $ 9,741 $ 38,026 $ 38,644
Cash balance 10,000   $ 20,800  
Line of credit facility, remaining borrowing capacity 21,000      
Income Taxes [Abstract]        
Interest and penalties expense $ 0 $ 0