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Nature of the Business and Basis of Presentation (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 15, 2025
USD ($)
$ / shares
shares
Dec. 10, 2024
USD ($)
Dec. 08, 2024
$ / shares
shares
Apr. 12, 2024
USD ($)
Jan. 25, 2022
shares
Apr. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
$ / shares
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
$ / shares
Jun. 30, 2025
USD ($)
segment
$ / shares
Jun. 30, 2024
USD ($)
Mar. 26, 2025
shares
Dec. 20, 2024
$ / shares
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Conversion of stock, conversion basis (in shares) | shares                       1  
Number of operating segments | segment                   1      
Accumulated deficit             $ 400,105,000   $ 439,338,000 $ 439,338,000      
Net cash used in operating activities                   9,064,000 $ 23,891,000    
Cash and cash equivalents             22,493,000   32,569,000 32,569,000      
Proceeds from the Securities Purchase Agreement           $ 20,000,000              
Private Placement                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Proceeds from issuance or sale of equity   $ 10,000,000         $ 10,000,000.0            
At The Market Program                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Value of shares issued in transaction                 3,100,000 3,100,000      
Sale of stock, consideration                 $ 2,000,000.0        
Proceeds from the Securities Purchase Agreement                   2,039,000 0    
Registered Direct Offering                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Sale of stock, consideration $ 18,800,000                        
Sale of stock, number of shares issued in transaction (in shares) | shares 6,451,612                        
Sale of stock, offering price (in dollars per share) | $ / shares $ 3.10                        
Proceeds from the Securities Purchase Agreement $ 20,000,000                 $ 18,769,000 $ 0    
Sale of stock, placement agent fee, percent of gross proceeds 4.00%                        
Class A ordinary shares                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Shelf registration, maximum consideration   $ 150,000,000                      
Par value (in dollars per share) | $ / shares             $ 0.0001   $ 0.0001 $ 0.0001     $ 0.0001
Sale of stock, number of shares issued in transaction (in shares) | shares         5,816,770                
Class A ordinary shares | Private Placement                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Stock issued (in shares) | shares     3,571,429                    
Weighted average share price (USD per share) | $ / shares     $ 2.80                    
Secured Convertible Notes                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Principal outstanding amount       $ 50,000,000                  
Convertible Debt | Secured Convertible Notes                          
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                          
Debt instrument, face amount       $ 30,000,000                  
Proceeds from issuance of secured notes               $ 27,600,000          
Variable rate       6.50%                  
Variable rate, event of default       4.00%                  
Principal outstanding amount                 $ 50,000,000 $ 50,000,000