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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 04, 2024
Apr. 05, 2023
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Sep. 15, 2022
Operating Loss Carryforwards [Line Items]                  
Operating loss carryforwards subject to expiration             $ 88,200    
Unrecognized tax benefits             344 $ 344  
Proceeds from sale of NOLs, gross $ 8,900                
Proceeds from sale of NOLs $ 700                
Benefit from income taxes   $ 800 $ 0 $ (2,330) $ (798) $ (2,330)      
Loss on sale of NOL   $ 100              
CEND                  
Operating Loss Carryforwards [Line Items]                  
Fair value market of tax NOLs             $ 36,100    
Effective income tax rate reconciliation             2.54%    
NOL annual limitation               917  
Federal                  
Operating Loss Carryforwards [Line Items]                  
Net operating loss carryforwards, prior to write down             $ 43,700 33,700  
Net operating loss carryforwards               34,000  
Federal | Research Tax Credit Carryforward                  
Operating Loss Carryforwards [Line Items]                  
Tax credit carryforward             500    
Federal | CEND                  
Operating Loss Carryforwards [Line Items]                  
Net operating loss carryforwards               3,600 $ 3,100
Operating loss carryforwards, post acquisition               459  
State | Research Tax Credit Carryforward                  
Operating Loss Carryforwards [Line Items]                  
Tax credit carryforward             100    
State | CEND                  
Operating Loss Carryforwards [Line Items]                  
Net operating loss carryforwards                 $ 4,300
State | New Jersey                  
Operating Loss Carryforwards [Line Items]                  
Net operating loss carryforwards             19,400 35,500  
State | California                  
Operating Loss Carryforwards [Line Items]                  
Net operating loss carryforwards             9,200 9,200  
State | New York                  
Operating Loss Carryforwards [Line Items]                  
Net operating loss carryforwards             1,900 1,900  
Foreign Tax Authority | CEND                  
Operating Loss Carryforwards [Line Items]                  
Net operating loss carryforwards             $ 2,400 $ 1,800