Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details)

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Basis of Presentation and Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
 1 Months Ended
Jul. 01, 2027
Sep. 30, 2024
Dec. 31, 2023
Dec. 15, 2023
Sep. 30, 2023
Dec. 31, 2022
Cash, Cash Equivalents and Restricted Cash            
Unrestricted cash   $ 4,018 $ 124,938      
Unrestricted cash equivalents   138,032 28,352      
Total unrestricted cash and cash equivalents   142,050 153,290      
Short-term restricted cash   80 160      
Long-term restricted cash   4,686 6,100      
Total restricted cash   4,766 6,260      
Total unrestricted and restricted cash and cash equivalents   146,816 159,550   $ 33,472 $ 57,826
Cash and Cash Equivalents            
Allowance for credit losses on investments in debt securities   0        
Available for sale securities, Amortized Cost Basis   25,033 $ 0      
Available for sale securities, Unrealized Gains   104        
Available for sale securities, Estimated Fair Value   25,137        
Restricted Cash            
Restricted cash released to unrestricted cash   1,250        
U.S. treasury bills            
Cash and Cash Equivalents            
Available for sale securities, Amortized Cost Basis   25,033        
Available for sale securities, Unrealized Gains   104        
Available for sale securities, Estimated Fair Value   $ 25,137        
Cash reserve accounts            
Cash, Cash Equivalents and Restricted Cash            
Total restricted cash       $ 6,300    
Cash reserve account, Interest and administrative fees            
Cash, Cash Equivalents and Restricted Cash            
Total restricted cash       5,800    
Cash reserve account, Interest and administrative fees | Forecast            
Restricted Cash            
Additional amount of cash required to fund reserve account $ 800          
Cash reserve account, Operating expenses            
Cash, Cash Equivalents and Restricted Cash            
Total restricted cash       $ 500