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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 |  |

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