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Description of Business, Organization and Liquidity - Additional Information (Details)
$ / shares in Units, $ in Thousands, € in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 19, 2024
EUR (€)
Aug. 09, 2023
USD ($)
$ / shares
shares
Nov. 30, 2021
USD ($)
$ / shares
shares
Jun. 30, 2025
USD ($)
$ / shares
shares
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
$ / shares
shares
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
$ / shares
shares
Jul. 04, 2025
EUR (€)
Jun. 30, 2025
EUR (€)
shares
May 06, 2025
EUR (€)
Feb. 15, 2023
USD ($)
Nov. 09, 2021
shares
Description Of Business Organization And Liquidity [Line Items]                          
Common stock, par value | $ / shares       $ 0.001   $ 0.001   $ 0.001          
Accumulated deficit | $       $ (407,951)   $ (407,951)   $ (359,313)          
Net losses | $       (26,217) $ (20,686) (48,638) $ (40,143) (95,500)          
Cash and cash equivalents | $       $ 28,131 $ 100,747 $ 28,131 $ 100,747 $ 60,031          
Net proceeds from IPO, after deducting underwriting discounts, commissions and offering costs | $     $ 103,300                    
Convertible preference share issued upon conversion                         20,592,413
Common stock shares issued       65,880,914   65,880,914   65,880,914   65,880,914      
Common stock shares outstanding       65,880,914   65,880,914   65,880,914   65,880,914     28,815,267
Common stock shares authorized       300,000,000   300,000,000   300,000,000   300,000,000     300,000,000
Preferred stock shares authorized       5,000,000   5,000,000   5,000,000   5,000,000      
Proceeds from private placement | $   $ 71,900                      
EIB Loan Facility                          
Description Of Business Organization And Liquidity [Line Items]                          
Loan facility | € € 57.5                        
Credit facility, aggregate principal amount | € 37.5                        
Certain conditions precedent, and one uncommitted accordion tranche | € € 20.0                        
Tranche A                          
Description Of Business Organization And Liquidity [Line Items]                          
Shares issued           5,623,664              
Avaliable amount to draw | €                     € 10.0    
Tranche B                          
Description Of Business Organization And Liquidity [Line Items]                          
Shares issued           4,221,868              
Tranche B | Subsequent Event                          
Description Of Business Organization And Liquidity [Line Items]                          
Avaliable amount to draw | €                 € 12.5        
Tranche C                          
Description Of Business Organization And Liquidity [Line Items]                          
Avaliable amount to draw | €                   € 15.0      
Class A Ordinary Shares                          
Description Of Business Organization And Liquidity [Line Items]                          
Common stock, par value | $ / shares     $ 0.16                    
Common stock conversion basis     one-for-one                    
Class B Preference Shares                          
Description Of Business Organization And Liquidity [Line Items]                          
Common stock, par value | $ / shares     $ 0.001                    
Common stock conversion basis     one-for-one                    
Class C Preference Shares                          
Description Of Business Organization And Liquidity [Line Items]                          
Common stock, par value | $ / shares     $ 0.001                    
Common stock conversion basis     one-for-one                    
Undesignated Preferred Stock                          
Description Of Business Organization And Liquidity [Line Items]                          
Preferred stock shares authorized                         5,000,000
Underwriters                          
Description Of Business Organization And Liquidity [Line Items]                          
Shares issued     1,072,500                    
IPO                          
Description Of Business Organization And Liquidity [Line Items]                          
Shares issued     8,222,500                    
Common stock shares sold, price per share | $ / shares     $ 14                    
Private Placement                          
Description Of Business Organization And Liquidity [Line Items]                          
Common stock, par value | $ / shares   $ 0.001                      
Shares issued   37,065,647                      
Warrants Issued   37,065,647                      
Purchase price per share of common stock and warrant | $ / shares   $ 2.025                      
Offering expenses | $   $ 3,200                      
Private Placement | Maximum | Common Stock                          
Description Of Business Organization And Liquidity [Line Items]                          
Shares issued   37,065,647                      
At-The-Market Equity Program                          
Description Of Business Organization And Liquidity [Line Items]                          
Shares issued           0              
Common stock, maximum aggregate offering price | $                       $ 19,500  
At-The-Market Equity Program | Sales Agreement                          
Description Of Business Organization And Liquidity [Line Items]                          
Common stock, maximum aggregate offering price | $                       $ 75,000