EQUITY - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock-based compensation expense	$ 26,098	$ 5,324	$ 51,976	$ 10,665
Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock-based compensation expense	23,567	1,795	47,041	3,521
Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock-based compensation expense	1,453	3,278	3,294	6,737
Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense \| Warrant
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock-based compensation expense	0	2,500	0	4,700
Location, Statement of Income, Balance [Axis]: us-gaap:SellingAndMarketingExpense
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock-based compensation expense	898	103	1,309	182
Location, Statement of Income, Balance [Axis]: figr:OperationsAndProcessingExpense
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock-based compensation expense	$ 180	$ 148	$ 332	$ 225

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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