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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Total share-based compensation expense $ 445 $ 276 $ 741 $ 541
Unvested Stock Option        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Unrecognized compensation $ 200   $ 200  
Weighted average period     1 year 9 months 18 days  
Restricted stock units        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Shares underlying unvested 276,000,000   276,000,000  
Additional stock-based compensation expense $ 300   $ 300  
Unrecognized compensation 200   $ 200  
Weighted average period     1 year 8 months 12 days  
Research and development expenses        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Total share-based compensation expense 13 32 $ 56 63
General and administrative expenses        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Total share-based compensation expense 147 $ 244 400 $ 478
Restructuring and other costs        
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]        
Total share-based compensation expense $ 285   $ 285