Quarterly report pursuant to Section 13 or 15(d)

Convertible Redeemable Preferred Stock and Stockholders' Equity - Common Stock Plan (Details)

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Convertible Redeemable Preferred Stock and Stockholders' Equity - Common Stock Plan (Details)
 3 Months Ended 6 Months Ended
Sep. 13, 2021
shares
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2023
USD ($)
shares
Mar. 15, 2024
Mar. 14, 2024
Dec. 31, 2023
shares
Jan. 24, 2023
Jan. 23, 2023
Convertible Preferred Stock and Stockholders' Equity                  
Stock-based compensation | $   $ 64,000 $ 128,000            
Shares unvested   16 16            
Restricted stock                  
Convertible Preferred Stock and Stockholders' Equity                  
Unamortized compensation costs | $   $ 1,620,000 $ 1,620,000            
Weighted-average period     2 years            
Number of stock released     774            
Shares unvested   260,441 260,441       5,382    
Number of restricted shares granted     255,915            
LTSI                  
Convertible Preferred Stock and Stockholders' Equity                  
Maximum shares authorized to issue, percentage   15.00% 15.00%   15.00% 8.00%      
Percentage of maximum shares issued in a year   8 8         15 8
Number of shares available for grant   477,774 477,774            
LTSI | Restricted stock units                  
Convertible Preferred Stock and Stockholders' Equity                  
Number of stock released     774 24          
Aggregate intrinsic value | $     $ 2,000 $ 5,000          
2020 Stock Incentive Plan | Restricted stock                  
Convertible Preferred Stock and Stockholders' Equity                  
Unamortized compensation costs | $   $ 0 $ 0            
Number of stock released     1 0          
Aggregate intrinsic value | $     $ 1,000            
2020 Stock Incentive Plan | Restricted stock units                  
Convertible Preferred Stock and Stockholders' Equity                  
Number of stock released     1            
Shares unvested             1    
September 2021 Inducement Grant                  
Convertible Preferred Stock and Stockholders' Equity                  
Unrecognized tax benefits, interest on income taxes expense | $     $ 57,000            
Vesting term     2 months 12 days            
September 2021 Inducement Grant | Restricted stock                  
Convertible Preferred Stock and Stockholders' Equity                  
Number of restricted shares granted     0            
September 2021 Inducement Grant | Restricted stock units                  
Convertible Preferred Stock and Stockholders' Equity                  
Number of units issued 21                
2022 Plan | Restricted stock                  
Convertible Preferred Stock and Stockholders' Equity                  
Number of restricted shares granted     3            
2022 Plan | Restricted stock units                  
Convertible Preferred Stock and Stockholders' Equity                  
Unamortized compensation costs | $   $ 94,000 $ 94,000            
Weighted-average period     2 years            
2022 | Restricted stock units                  
Convertible Preferred Stock and Stockholders' Equity                  
Number of stock released     3 0          
Aggregate intrinsic value | $     $ 1,000            
Shares unvested   14 14       17