v3.26.1
FAIR VALUE MEASUREMENTS - Schedule of Financial Assets and Liabilities Subject to Fair Value Measurements (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Jun. 30, 2025
Dec. 31, 2025
Assets:        
PropTech convertible trading debt securities $ 1,229     $ 1,229
Long-term investments        
Long-term investment securities at fair value 3,184     3,170
Total long-term investments 3,184     3,170
Liabilities:        
Loss on changes in fair value of the derivative embedded within convertible debt 0 $ (746)    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money Market Funds        
Liabilities:        
Current restricted assets 4,522     4,716
Non-current restricted assets 2,483     2,483
Recurring        
Assets:        
Debt Securities, Trading, Noncurrent       1,229
PropTech convertible trading debt securities 1,229      
Long-term investments        
Long-term investment securities at fair value 3,184     3,170
Total long-term investments 3,184     4,399
Total assets 86,422     112,933
Liabilities:        
Fair value of the derivative embedded within convertible debt       0
Total       0
Loss on changes in fair value of the derivative embedded within convertible debt     $ (28,482)  
Recurring | Money Market Funds        
Assets:        
Cash and cash equivalents 81,847     108,372
Recurring | Certificates of Deposit        
Assets:        
Cash and cash equivalents 162     162
Recurring | Certificates of Deposit | Other Noncurrent Assets        
Assets:        
Cash and cash equivalents 162     162
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)        
Assets:        
Debt Securities, Trading, Noncurrent       0
PropTech convertible trading debt securities 0      
Long-term investments        
Long-term investment securities at fair value 0     0
Total long-term investments 0     0
Total assets 81,847     108,372
Liabilities:        
Fair value of the derivative 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 81,847     108,372
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:        
Debt Securities, Trading, Noncurrent       0
PropTech convertible trading debt securities 0      
Long-term investments        
Long-term investment securities at fair value 0     0
Total long-term investments 0     0
Total assets 162     162
Liabilities:        
Fair value of the derivative 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) | Certificates of Deposit        
Assets:        
Cash and cash equivalents 162     162
Recurring | Significant Unobservable Inputs (Level 3)        
Assets:        
Debt Securities, Trading, Noncurrent       1,229
PropTech convertible trading debt securities 1,229      
Long-term investments        
Long-term investment securities at fair value 0     0
Total long-term investments 0     1,229
Total assets 1,229     1,229
Liabilities:        
Fair value of the derivative embedded within convertible debt       0
Total       0
Recurring | Significant Unobservable Inputs (Level 3) | Money Market Funds        
Assets:        
Cash and cash equivalents 0     0
Recurring | Significant Unobservable Inputs (Level 3) | Certificates of Deposit        
Assets:        
Cash and cash equivalents $ 0     $ 0