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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 |  |  |  |  |
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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 |

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