Annual report [Section 13 and 15(d), not S-K Item 405]

Income Taxes (Effective Income Tax Rate Reconciliation) (Details)

v3.26.1
Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Amount    
U.S. federal statutory tax rate $ (7,020)  
State and local income taxes, net of federal income tax effect $ 1,525  
Effective Income Tax Rate Reconciliation, State and Local Jurisdiction, Contribution Greater than 50 Percent, Tax Effect [Extensible Enumeration] fbio:NewYorkCityMember, stpr:FL, stpr:MA, stpr:NY  
Tax credits $ (325)  
Change in valuation allowance (75,103)  
Share-based compensation 5,206  
Transaction costs 3,106  
Other (191)  
Changes in unrecognized tax benefits (2,073)  
Sale of subsidiaries 75,159  
Sale of IP (1,515)  
Other 611  
Total $ (620) $ 312
Tax Jurisdiction of Domicile [Extensible Enumeration] country:US  
Percent    
U.S. federal statutory tax rate 21.00% 21.00%
State and local income taxes, net of federal income tax effect1 (4.60%) 4.20%
Tax credits 1.00% 1.80%
Non-deductible items   (0.50%)
Provision to return   (3.70%)
Change in state rate   (8.20%)
Change in valuation allowance 224.70% (9.60%)
Share-based compensation (15.60%) (0.40%)
Transaction costs (9.30%)  
Other 0.60%  
Changes in unrecognized tax benefits 6.20%  
Sale of subsidiaries (224.80%)  
Change in subsidiary basis   (1.00%)
Adjustment for warrants   (0.10%)
Section 162(m) compensation disallowance   (3.50%)
Sale of IP 4.50%  
Other (1.80%) (0.20%)
Effective income tax rate 1.90% (0.20%)