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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Fair Value Measurements (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Assets:      
PropTech convertible trading debt securities $ 1,254,000 $ 1,162,000  
Long-term investments      
Long-term investment securities at fair value 3,127,000 2,821,000  
Total long-term investments 3,127,000 3,983,000  
Liabilities:      
Total Gains (Losses) (14,978,000) 0 $ 0
Total long-term investments 9,527,000 12,871,000  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds      
Liabilities:      
Current restricted assets 4,081,000 7,171,000  
Non-current restricted assets 2,483,000 2,538,000  
Recurring      
Assets:      
PropTech convertible trading debt securities 1,254,000    
Long-term investments      
PropTech convertible trading debt securities   1,162,000  
Long-term investment securities at fair value 3,127,000 2,821,000  
Total long-term investments 3,127,000 3,983,000  
Total assets 143,167,000 115,285,000  
Liabilities:      
Fair value of derivatives embedded within convertible debt 30,253,000    
Total 30,253,000    
Total Gains (Losses) (14,978,000)    
Recurring | Money market funds      
Assets:      
Cash and cash equivalents 85,535,000 59,595,000  
Recurring | U. S. treasury bills      
Assets:      
Cash and cash equivalents 52,744,000 51,200,000  
Recurring | U. S. treasury bills | Cash and Cash Equivalents      
Assets:      
Cash and cash equivalents 42,940,000    
Recurring | U. S. treasury bills | Other current assets      
Assets:      
Cash and cash equivalents 9,804,000    
Recurring | Certificates of deposit      
Assets:      
Cash and cash equivalents 507,000 507,000  
Recurring | Certificates of deposit | Other current assets      
Assets:      
Cash and cash equivalents 345,000    
Recurring | Certificates of deposit | Other assets      
Assets:      
Cash and cash equivalents 162,000    
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Assets:      
PropTech convertible trading debt securities 0    
Long-term investments      
PropTech convertible trading debt securities   0  
Long-term investment securities at fair value 0 0  
Total long-term investments 0 0  
Total assets 138,279,000 110,795,000  
Liabilities:      
Fair value of derivatives embedded within convertible debt 0    
Total 0    
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds      
Assets:      
Cash and cash equivalents 85,535,000 59,595,000  
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U. S. treasury bills      
Assets:      
Cash and cash equivalents 52,744,000 51,200,000  
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Certificates of deposit      
Assets:      
Cash and cash equivalents 0 0  
Recurring | Significant Other Observable Inputs (Level 2)      
Assets:      
PropTech convertible trading debt securities 0    
Long-term investments      
PropTech convertible trading debt securities   0  
Long-term investment securities at fair value 0 0  
Total long-term investments 0 0  
Total assets 507,000 507,000  
Liabilities:      
Fair value of derivatives embedded within convertible debt 0    
Total 0    
Recurring | Significant Other Observable Inputs (Level 2) | Money market funds      
Assets:      
Cash and cash equivalents 0 0  
Recurring | Significant Other Observable Inputs (Level 2) | U. S. treasury bills      
Assets:      
Cash and cash equivalents 0 0  
Recurring | Significant Other Observable Inputs (Level 2) | Certificates of deposit      
Assets:      
Cash and cash equivalents 507,000 507,000  
Recurring | Significant Unobservable Inputs (Level 3)      
Assets:      
PropTech convertible trading debt securities 1,254,000    
Long-term investments      
PropTech convertible trading debt securities   1,162,000  
Long-term investment securities at fair value 0 0  
Total long-term investments 0 1,162,000  
Total assets 1,254,000 1,162,000  
Liabilities:      
Fair value of derivatives embedded within convertible debt 30,253,000    
Total 30,253,000    
Recurring | Significant Unobservable Inputs (Level 3) | Money market funds      
Assets:      
Cash and cash equivalents 0 0  
Recurring | Significant Unobservable Inputs (Level 3) | U. S. treasury bills      
Assets:      
Cash and cash equivalents 0 0  
Recurring | Significant Unobservable Inputs (Level 3) | Certificates of deposit      
Assets:      
Cash and cash equivalents 0 $ 0  
Nonrecurring      
Long-term investments      
Total long-term investments 0    
Total assets 0    
Liabilities:      
Total Gains (Losses) 489,000    
Total long-term investments 489,000    
Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Long-term investments      
Total long-term investments    
Total assets    
Nonrecurring | Significant Other Observable Inputs (Level 2)      
Long-term investments      
Total long-term investments    
Total assets    
Nonrecurring | Significant Unobservable Inputs (Level 3)      
Long-term investments      
Total long-term investments 0    
Total assets $ 0