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INCOME TAXES - Effective Income Tax Rate (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Amount [Abstract]      
Statutory federal income tax rate $ (21,732)    
State and local income taxes, net of federal benefit 0    
Federal research & development (1,490)    
Changes in valuation allowance 5,263    
Stock compensation 5,705    
Goodwill impairment 10,316    
Other 321    
Other reconciling items 237    
Unrecognized tax benefits 373    
Income tax benefit $ 0 $ 0 $ 0
Percent [Abstract]      
Tax benefit at federal statutory rate 21.00% 21.00% 21.00%
State income taxes, net of federal benefit 0.00% 0.00% (0.01%)
Federal research & development 1.44%    
Valuation allowance (5.09%) (7.24%) (7.54%)
Stock compensation (5.51%)    
Goodwill impairment (9.97%) (13.06%) (10.94%)
Other (0.31%)    
Other reconciling items (0.23%)    
Unrecognized tax benefits (0.36%) (0.78%) (0.81%)
Foreign rate differential   0.06% (0.22%)
Change in federal and state statutory rate   1.69% 0.01%
Other adjustments   (1.61%) (1.40%)
Income tax benefit 0.00% 0.06% 0.09%
United Kingdom      
Amount [Abstract]      
Foreign tax effects: $ 2,228    
Other $ (1,234)    
Percent [Abstract]      
Foreign rate differential (2.15%)    
Other 1.19%    
Other jurisdictions      
Amount [Abstract]      
Foreign tax effects: $ 13    
Percent [Abstract]      
Foreign rate differential (0.01%)