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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Thousands
3 Months Ended
Aug. 14, 2017
USD ($)
Mar. 31, 2018
USD ($)
School
State
Campus
Segment
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Apr. 28, 2017
USD ($)
Dec. 31, 2016
USD ($)
Business Activities [Abstract]            
Number of schools | School   23        
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        
Number of campuses operating under HOPS | Campus   18        
Number of campuses closed under HOPS | Campus   7        
Number of campuses remaining under HOPS | Campus   11        
Liquidity [Abstract]            
Gain on sale of property   $ (117) $ 26      
Cash and cash equivalents   13,353 19,896 $ 54,554   $ 47,715
Restricted cash   8,500        
Revolving loan facility, available amount   1,900        
Income Taxes [Abstract]            
Interest and penalties expense   0 $ 0      
West Palm Beach Property [Member]            
Liquidity [Abstract]            
Cash purchase price $ 15,800 $ 8,000        
Gain on sale of property 1,500          
Short term loan         $ 8,000  
Repayment of term loan $ 8,000