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Notes Payable, Preferred Stock and Stock Purchase Warrants - Interest expense (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Aug. 10, 2023
Aug. 09, 2020
Long term debt        
Interest $ 3,438 $ 2,808    
Debt Discount and Fees 2,734 6,408    
Issuance Costs 94 172    
Total Interest Expense $ 6,266 $ 9,388    
2023 Notes        
Long term debt        
Effective interest rate (as percentage)   5.25%    
Interest   $ 69    
Debt Discount and Fees   120    
Total Interest Expense   $ 189    
2025 Notes        
Long term debt        
Effective interest rate (as percentage) 5.25% 5.25% 15.54%  
Interest $ 803 $ 1,881    
Debt Discount and Fees 2,083 4,808    
Issuance Costs 35 81    
Total Interest Expense $ 2,921 $ 6,770    
PHC Notes        
Long term debt        
Effective interest rate (as percentage)   8.00%   29.19%
Interest   $ 700    
Debt Discount and Fees   1,442    
Issuance Costs   88    
Total Interest Expense   $ 2,230    
Loan and Security Agreement        
Long term debt        
Effective interest rate (as percentage) 9.90% 9.90%    
Interest $ 2,635 $ 158    
Debt Discount and Fees 651 38    
Issuance Costs 59 3    
Total Interest Expense $ 3,345 $ 199