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RELATED PARTY TRANSACTIONS (Details) |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 20, 2024 USD ($) | Jul. 02, 2024 USD ($) $ / shares | May 31, 2022 USD ($) | Dec. 31, 2024 USD ($) board_member $ / shares | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2020
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Investment and other income |  |  |  | $ 5,289,000 | $ 633,000 | $ 3,429,000 |
Number of shared board members | board_member |  |  |  | 3 |  |  |
Equity in earnings (losses) from equity-method investments |  |  |  | $ 36,000 | (168,000) | (563,000) |
Senior Secured Convertible Notes Due July 2029 | Convertible Debt |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Debt issued |  | $ 50,000 |  |  |  |  |
Interest rate |  | 7.00% |  | 7.00% |  |  |
Paid-in-kind interest |  | 8.00% |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  | $ 1.50 |  |  |  |  |
Directors | Senior Secured Convertible Notes Due July 2029 | Convertible Debt |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Debt issued |  |  |  | $ 50,000,000 |  |  |
Interest rate |  |  |  | 7.00% |  |  |
Paid-in-kind interest |  |  |  | 8.00% |  |  |
Conversion price (in dollars per share) | $ / shares |  |  |  | $ 1.50 |  |  |
Entity Sold In 2019 |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Earn-out payment |  |  | $ 654,000 |  |  |  |
Equity in earnings (losses) from equity-method investments |  |  |  |  |  | 654,000 |
Entity Sold In 2019 | Entity Sold In 2019 |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 50.00%
Entity Sold In 2019 | Entity Sold In 2019 | Directors |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Non-controlling interest |  |  |  |  |  |  | 50.00%
Douglas Elliman Realty, LLC |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Proceeds from commissions received |  |  |  | $ 17,068,000 | 1,766,000 | 1,709,000 |
Vector Group Ltd. | Transition Services Agreement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Related party transaction, amounts of transaction |  |  |  | 4,084,000 | 4,200,000 | 4,200,000 |
Vector Group Ltd. | Aviation Agreements |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Related party transaction, amounts of transaction |  |  |  | 1,830,000 | 2,124,000 | 2,418,000 |
Vector Group Ltd. | Tax Indemnifications |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Investment and other income |  |  |  |  |  | 589,000 |
Douglas Elliman Realty, LLC | Commissions paid to son | President and Chief Executive Officer family |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Expenses from transactions with related party |  |  |  | 767,000 | 1,570,000 | 1,490,000 |
Douglas Elliman Realty, LLC | Commissions paid to spouse | President and Chief Executive Officer family |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Expenses from transactions with related party |  |  |  | 147,000 | 329,000 | 230,000 |
Douglas Elliman Realty, LLC | Commissions Paid To Son Of Executive Vice President and Chief Operating Officer | President and Chief Executive Officer family |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Expenses from transactions with related party |  |  |  | $ 303,000 | $ 369,000 | $ 352,000 |
Dr. Phillip Frost | Beneficial owner (more than) |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Initial monthly lease payments | $ 43,000 |  |  |  |  |  |
Final monthly lease payments | $ 48,000 |  |  |  |  |  |
Dr. Phillip Frost | Douglas Elliman | Beneficial owner (more than) |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Non-controlling interest | 5.00% |  |  |  |  |  |

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