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REAL ESTATE TRANSACTIONS, Property Sale Agreement - Nashville, Tennessee Campus (Details)
3 Months Ended
Jun. 08, 2023
USD ($)
Mar. 31, 2024
USD ($)
Term
Dec. 31, 2023
USD ($)
Sep. 24, 2021
a
Property Sale Agreement - Nashville, Tennessee Campus [Abstract]        
Carrying value   $ 52,005,000 $ 50,857,000  
Prepaid expenses and other current assets   $ 6,071,000 $ 5,556,000  
Property Sale Agreement [Member]        
Property Sale Agreement - Nashville, Tennessee Campus [Abstract]        
Area of property to sell | a       16
Sale price of agreement $ 33,800,000      
Lease period for rent-free basis   15 months    
Period of additional option to extend lease   30 days    
Rental payment per extension term   $ 150,000    
Carrying value   4,500,000    
Amount of lease for rent-free period   2,300,000    
Prepaid expenses and other current assets   $ 800,000    
Property Sale Agreement [Member] | Maximum [Member]        
Property Sale Agreement - Nashville, Tennessee Campus [Abstract]        
Number of additional lease terms | Term   3