Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details)

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Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Feb. 17, 2022
Income Taxes (Details) [Line Items]      
Federal statutory income tax rate 21.00% 21.00%  
Valuation allowance $ 96,363 $ 84,952  
Change in the valuation allowance 11,411 (1,799)  
Operating loss carryforwards 714,300 $ 786,600  
Net unrealized built-in gain $ 265,200   $ 330,700
Operating loss carryforwards, description Company's annual limitation is expected to be increased in the first five years    
Annual limitation amount per year     8,200
Net operating losses $ 87,800   $ 121,400
Net operating losses available 3,100    
Net operating losses restricted 6,000    
Net operating losses generated 55,000    
Net operating losses subject to limitation 3,800    
Net operating losses solely subject to limitation 58,100    
Federal research and development credit carryforwards for income tax expense $ 1,200    
Current carryforwards expiration term If not used, the current carryforwards will expire beginning in 2034.    
State [Member]      
Income Taxes (Details) [Line Items]      
Expiration term state operating loss carryforwards begin to expire in 2025.    
U.S. Federal [Member]      
Income Taxes (Details) [Line Items]      
Net operating losses $ 390,109