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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2018
USD ($)
Sep. 30, 2019
USD ($)
State
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
School
State
Campus
Segment
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business Activities [Abstract]              
Number of schools | School       22      
Number of states in which schools operate across the United States | State   14   14      
Number of campuses treated as destination schools | Campus       5      
Number of reportable segments | Segment       3      
Liquidity [Abstract]              
Cash and cash equivalents   $ 15,754 $ 18,003 $ 15,754 $ 18,003 $ 45,946 $ 54,554
Restricted cash   4,000   4,000      
Income Taxes [Abstract]              
Interest and penalties expense   $ 0 $ 0 $ 0 $ 0    
Credit Facility 1 [Member]              
Business Activities [Abstract]              
Line of credit facility, maximum borrowing capacity           22,700  
Mangonia Park Property [Member]              
Business Activities [Abstract]              
Cash purchase price $ 2,550            
Real estate brokerage fee percentage 5.00%            
Lincoln College of New England [Member]              
Business Activities [Abstract]              
Lease termination costs           1,600  
Severance payment           $ 700