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Income Taxes - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
NOL carryforwards      
Income tax provision (benefit) $ 2,555,000 $ 1,383,000 $ (1,758,000)
Effective tax rate 0.00% 0.00% 0.00%
Deferred tax assets, net of valuation allowance $ 22,506,000 $ 24,827,000  
Increase (decrease) in valuation allowance 158,900,000 157,700,000  
Disallowed interest expense 28,300,000    
Unrecognized tax benefits, interest and penalties accrued 0 0  
Tax benefit 14,753,000 $ 11,539,000 $ 7,382,000
United Kingdom      
NOL carryforwards      
Operating loss carryforwards 21,200,000    
Switzerland      
NOL carryforwards      
Operating loss carryforwards 75,800,000    
Federal      
NOL carryforwards      
Net operating loss carryforwards for income tax purposes 1,800,000,000    
Tax credit carryforwards 190,200,000    
Operating loss carryforwards 1,600,000,000    
Various states      
NOL carryforwards      
Tax credit carryforwards 4,700,000    
Operating loss carryforwards 1,100,000,000    
Ireland      
NOL carryforwards      
Operating loss carryforwards, non-trading loss $ 361,000,000