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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 09, 2018
USD ($)
Mar. 31, 2019
USD ($)
School
State
Campus
Segment
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Population
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   3      
Revenues   $ 63,263 $ 61,889    
Net loss   (5,467) (6,874)    
Liquidity [Abstract]          
Cash and cash equivalents   10,181 13,353 $ 45,946 $ 54,554
Restricted cash   4,500      
Income Taxes [Abstract]          
Interest and penalties expense   $ 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]          
Revenues         8,400
Net loss         $ 1,600
Population | Population         397
Lease termination costs       1,600  
Severance payment       $ 700