Quarterly report pursuant to Section 13 or 15(d)

Unsecured Promissory Notes Payable - Narrative (Details)

v3.23.2
Unsecured Promissory Notes Payable - Narrative (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jan. 26, 2023
USD ($)
$ / shares
shares
Feb. 28, 2022
USD ($)
$ / shares
shares
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jan. 27, 2023
shares
Jan. 12, 2023
$ / shares
Sep. 15, 2020
USD ($)
investor
Short-Term Debt [Line Items]                  
Exercise price (in dollars per share) | $ / shares               $ 10.00  
Warrants term (in years)             5 years 1 year  
Conversion price (in dollars per share) | $ / shares   $ 5.75              
Cash paid   $ 1,441              
Principal amount   1,400              
Interest payable   41              
Debt conversion   1,150              
Periodic payment   2,591              
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 volatility rate 81.50%                
Risk free interest rate 3.62%                
Warrants term (in years) 5 years                
Warrant, fair value $ 380                
Black-Scholes Option Pricing Model | 2023 Notes Warrants                  
Short-Term Debt [Line Items]                  
Warrant fair value 400                
Unsecured Debt                  
Short-Term Debt [Line Items]                  
Debt, face amount   $ 600              
Conversion shares (in shares) | shares   200,000              
Conversion price (in dollars per share) | $ / shares   $ 3.00              
Unsecured Debt | Letter Agreement                  
Short-Term Debt [Line Items]                  
Debt, face amount   $ 2,000              
September 2020 Notes                  
Short-Term Debt [Line Items]                  
Unpaid balance     $ 2,400 $ 8,000 $ 2,400 $ 8,000      
September 2020 Notes | Unsecured Debt                  
Short-Term Debt [Line Items]                  
Debt, face amount                 $ 10,000
Interest rate     10.00%   10.00%        
Number of investors | investor                 2
Interest expense     $ 272 $ 200 $ 487 $ 433      
2023 Note | Unsecured Debt                  
Short-Term Debt [Line Items]                  
Debt, face amount $ 7,600                
Interest rate 10.00%                
2023 Note | Unsecured Debt | 2023 Notes Warrants                  
Short-Term Debt [Line Items]                  
Debt, face amount     7,200   7,200        
Debt discount     $ 300   $ 300