Annual report pursuant to Section 13 and 15(d)

Outstanding Debt (Details)

v3.24.1
Outstanding Debt (Details)
 1 Months Ended 12 Months Ended
Dec. 20, 2023
USD ($)
Sep. 10, 2023
USD ($)
shares
Jan. 26, 2023
USD ($)
$ / shares
shares
Feb. 28, 2022
USD ($)
$ / shares
shares
Nov. 30, 2022
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jan. 27, 2023
shares
Jan. 12, 2023
$ / shares
Sep. 15, 2020
USD ($)
debt
investor
Short-term Debt [Line Items]                    
Periodic payment       $ 2,600,000            
Escrow amount           $ 540,000        
Exercise price (in dollars per share) | $ / shares                 $ 10.00  
Warrant fair value             $ 0      
Expected stock price volatility           80.00% 79.00%      
Risk-free rate of interest           3.70% 2.50%      
Warrants outstanding, term (in years)           1 year   5 years    
Conversion price (in dollars per share) | $ / shares       $ 5.75            
Cash       $ 1,400,000            
Remaining principal amount       1,400,000            
Interest payable       41,000            
Debt conversion, principal amount       1,200,000            
2023 Notes Warrants                    
Short-term Debt [Line Items]                    
Warrants (in shares) | shares     76,000         76,000    
Exercise price (in dollars per share) | $ / shares     $ 9.00              
Weighted average remaining contractual life, options vested and exercisable (in years)     5 years              
Expected stock price volatility     81.50%              
Risk-free rate of interest     3.62%              
Warrants outstanding, term (in years)     5 years              
Warrant, fair value     $ 400,000              
2023 Notes Warrants | Black-Scholes Option Pricing Model                    
Short-term Debt [Line Items]                    
Warrant fair value     400,000              
Unsecured Debt                    
Short-term Debt [Line Items]                    
Aggregate principal amount       $ 600,000            
Common stock issued (in shares) | shares       200,000            
Conversion price (in dollars per share) | $ / shares       $ 3.00            
Debt conversion, amount   $ 2,400,000                
Debt conversion, common stock (in shares) | shares   800,000                
Unsecured Debt | Letter Agreement                    
Short-term Debt [Line Items]                    
Aggregate principal amount       $ 2,000,000            
2023 Secured Mortgage Loan | Secured Debt                    
Short-term Debt [Line Items]                    
Aggregate principal amount $ 3,300,000                  
Interest rate (as a percent) 8.25%                  
Periodic payment $ 25,000                  
Debt issuance costs $ 341,000                  
Escrow amount           $ 540,000        
2023 Note | Unsecured Debt                    
Short-term Debt [Line Items]                    
Aggregate principal amount     $ 7,600,000              
Interest rate (as a percent)     10.00%              
2023 Note | Unsecured Debt | 2023 Notes Warrants                    
Short-term Debt [Line Items]                    
Aggregate principal amount           7,300,000        
Debt discount           300,000        
September 2020 Notes | Unsecured Debt                    
Short-term Debt [Line Items]                    
Aggregate principal amount                   $ 10,000,000
Number of debt instruments | debt                   2
Number of investors | investor                   2
Repayments of long-term debt         $ 5,600,000          
Interest expense           $ 800,000 $ 800,000