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Notes Payable, Preferred Stock and Stock Purchase Warrants - Convertible Notes (Details)
 1 Months Ended 3 Months Ended 5 Months Ended 9 Months Ended 12 Months Ended
Aug. 10, 2023
USD ($)
shares
Mar. 31, 2023
USD ($)
Jan. 31, 2023
USD ($)
Aug. 09, 2020
USD ($)
$ / shares
shares
Jul. 31, 2019
USD ($)
$ / shares
Mar. 31, 2018
USD ($)
$ / shares
Jan. 27, 2021
USD ($)
shares
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
$ / shares
Sep. 30, 2024
USD ($)
$ / shares
Apr. 30, 2022
Apr. 21, 2020
USD ($)
Long term debt                        
Carrying Amount                 $ 41,195,000 $ 34,448,000    
Derivative liabilities                 $ 102,000      
Common stock, par value per share (in dollars per share) | $ / shares                 $ 0.001 $ 0.001    
PHC Notes                        
Long term debt                        
Principal amount   $ 35,000,000.0   $ 35,000,000.0                
Conversion rate (per $1,000 of principal)       1,901.7956                
Amount of principal which is converted to shares       $ 1,000                
Conversion price (in dollars per share) | $ / shares       $ 0.53                
Gain (Loss) on extinguishment of debt   48,600,000             $ 100,000      
Carrying Amount   25,400,000                    
Effective interest rate (as percentage)       29.19%       8.00%        
Financing fee shares issued | shares       2,941,176                
Common stock, par value per share (in dollars per share) | $ / shares       $ 0.001                
Debt Discount Of Financing Fee Shares       $ 1,500,000                
Interest rate (as a percent)       9.50%             8.00%  
Value of shares issued on conversion       $ 15,000,000.0                
Fair value of the embedded conversion option   0   25,800,000                
Issuance costs incurred       2,900,000                
Debt issuance costs and discounts       1,400,000                
Original debt conversion amount       $ 0                
Interest Payable   23,200,000                    
Net gain on exchange of debt instrument               $ 18,800,000        
PHC Notes | Debt Redemption on or After October 31, 2022                        
Long term debt                        
Threshold percentage of stock trigger       275.00%                
Notice period       10 days                
PHC Notes | Debt Redemption on or After October 31, 2023                        
Long term debt                        
Notice period       10 days                
PHC Notes | Debt Redemption Six Months Prior to Maturity Date                        
Long term debt                        
Call premium percentage       130.00%                
PHC Notes | Debt Redemption Within Six Months of Maturity Date                        
Long term debt                        
Call premium percentage       125.00%                
PHC Notes | Other income (expenses)                        
Long term debt                        
Change in fair value of embedded derivative   $ 44,200,000                    
2025 Notes                        
Long term debt                        
Principal amount $ 30,800,000       $ 82,000,000.0   $ 6,800,000   20,399,000 $ 20,399,000    
Conversion rate (per $1,000 of principal)         757.5758              
Amount of principal which is converted to shares         $ 1,000              
Conversion price (in dollars per share) | $ / shares         $ 1.32              
Debt converted, Shares issued | shares 35,100,000           5,152,259          
Gain (Loss) on extinguishment of debt $ (4,600,000)           $ 3,200,000          
Converted debt amount 7,500,000                      
Carrying Amount $ 20,400,000               17,257,000 19,376,000    
Derivative liabilities                 100,000 $ 0.0    
Effective interest rate (as percentage) 15.54%             5.25%   5.25%    
Interest rate (as a percent) 5.25%                      
Issuance costs incurred                 $ 52,000 $ 17,000    
2025 Notes | Exchange Agreement with Highbridge                        
Long term debt                        
Principal amount                       $ 24,000,000.0
2023 Notes                        
Long term debt                        
Principal amount           $ 53,000,000.0            
Conversion rate (per $1,000 of principal)           294.1176            
Amount of principal which is converted to shares           $ 1,000            
Conversion price (in dollars per share) | $ / shares           $ 3.40            
Gain (Loss) on extinguishment of debt     $ 20,000.00                  
Derivative liabilities           $ 17,300,000            
Effective interest rate (as percentage)               5.25%        
Repurchase price as a percent of principal amount           100.00%            
Transaction costs           $ 2,200,000            
Amortization percent           9.30%            
Repurchase amount           $ 37,000,000.0