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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Aug. 14, 2017
USD ($)
Jun. 30, 2018
USD ($)
State
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
School
State
Campus
Segment
Jun. 30, 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   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   $ 7 $ 63 $ (110) $ 89      
Cash and cash equivalents   11,571 13,399 11,571 13,399 $ 54,554   $ 47,715
Restricted cash   8,500   8,500        
Income Taxes [Abstract]                
Interest and penalties expense   $ 0 $ 0 $ 0 $ 0      
West Palm Beach Property [Member]                
Liquidity [Abstract]                
Cash purchase price $ 15,800              
Gain on sale of property 1,500              
Short term loan             $ 8,000  
Repayment of term loan $ 8,000