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Senior Secured Debt, in Default - Senior Secured Promissory Note Payable, in Default (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
3 Months Ended 6 Months Ended
Feb. 28, 2022
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Jul. 15, 2024
Dec. 31, 2023
Aug. 31, 2020
Debt Conversion [Line Items]                
Principal   $ 9,117   $ 9,117     $ 8,462  
Warrant exercise price (in dollars per share)   $ 0.01   $ 0.01        
Senior Secured Promissory Notes Payable                
Debt Conversion [Line Items]                
Principal $ 18,000 $ 26,079   $ 26,079     $ 21,562 $ 15,000
Debt instrument, basis spread on variable rate       3.00%        
Interest rate   9.00%   9.00%        
PIK interest       3.00%        
Additional default accrued interest rate   5.00%   5.00%        
Interest expense   $ 2,100 $ 1,700 $ 4,000 $ 3,300      
Senior Secured Promissory Notes Payable | NWPSA | Subsequent Event                
Debt Conversion [Line Items]                
Consent fee           $ 700    
Senior Secured Promissory Notes Payable | Second Amendment to Note and Warrant Purchase and Security Agreement                
Debt Conversion [Line Items]                
Principal $ 3,000              
Senior Secured Promissory Notes Payable | Second Amendment to Note and Warrant Purchase and Security Agreement | First Warrant                
Debt Conversion [Line Items]                
Warrants to purchase common stock (in shares) 16.2              
Warrant exercise price (in dollars per share) $ 0.18              
Senior Secured Promissory Notes Payable | Second Amendment to Note and Warrant Purchase and Security Agreement | Second Warrant                
Debt Conversion [Line Items]                
Warrants to purchase common stock (in shares) 20.6