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v3.26.1

Nature of Business (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 31 Months Ended | 41 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 19, 2026 USD ($) $ / shares shares | Jan. 05, 2026 USD ($) installment | Jan. 13, 2025 shares | Aug. 18, 2023 $ / shares shares | Aug. 16, 2023 $ / shares shares | Oct. 08, 2021 USD ($) | Feb. 28, 2026 USD ($) shares | Jan. 31, 2025 $ / shares shares | Mar. 31, 2026 USD ($) shares | Mar. 31, 2025 USD ($) shares | Mar. 31, 2026 USD ($) shares | Feb. 27, 2025 USD ($) shares | Dec. 31, 2025 USD ($) | Jan. 31, 2025 £ / shares shares | Feb. 29, 2024 | Jun. 30, 2023 USD ($)
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary share conversion ratio (in shares) |  |  |  | 1 |  | 1 |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | $ 91,202 | $ (17,864) |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  |  |  |  | 731,392 |  | $ 731,392 |  | $ 822,594 |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  | $ 466,010 | $ 260,110 | $ 466,010 |  | $ 149,608 |  |  |
PIPE Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, shares issued in transaction (in shares) | shares |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |
Issuance of ordinary shares to settle warrant exercised (in shares) | shares |  |  |  |  |  |  |  |  | 0 | 0 | 3,752,050 |  |  |  |  |
Proceeds from the exercise of ADS warrants |  |  |  |  |  |  |  |  |  |  | $ 37,300 |  |  |  |  |
Proceeds from warrant exercises, fully exercised |  |  |  |  |  |  |  |  | $ 122,400 |  |  |  |  |  |  |
Loan Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000
Loan Agreement, Term Loan One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes, face amount |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000
Amended Loan Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible notes, face amount |  | $ 150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of tranches | installment |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | $ 31,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |
At-The-Market Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, shares issued in transaction (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 5,491,836 |  |  |  |
Consideration received on transaction |  |  |  |  |  |  |  |  |  |  |  | $ 54,800 |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary share conversion ratio (in shares) |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Sale of stock, shares issued in transaction (in shares) | shares |  |  |  | 16,076,750 | 16,076,750 |  |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share (in dollars per share) | $ / shares |  |  |  |  | $ 7.78 |  |  |  |  |  |  |  |  |  |  |
Warrant exercise price (in dollars per share) | $ / shares |  |  |  |  | $ 9.93 |  |  |  |  |  |  |  |  |  |  |
Private Placement | PIPE Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercise price (in dollars per share) | $ / shares |  |  |  | $ 9.93 |  |  |  |  |  |  |  |  |  |  |  |
Term (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |
Underwritten Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, shares issued in transaction (in shares) | shares |  |  |  |  |  |  | 15,160,619 |  |  |  |  |  |  |  |  |
Consideration received on transaction | $ 140,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Underwritten Offering | 2025 ADS Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary share conversion ratio (in shares) |  |  | 1 |  |  |  |  | 1 |  |  |  |  |  |  |  |
Sale of stock, shares issued in transaction (in shares) | shares |  |  | 24,014,728 |  |  |  |  | 24,014,728 |  |  |  |  |  |  |  |
Sale of stock, price per share (in dollars per share) | (per share) |  |  |  |  |  |  |  | $ 4.2750 |  |  |  |  |  | £ 0.008 |  |
Warrant exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 5.7960 |  |  |  |  |  |  |  |
Term (in years) |  |  |  |  |  |  |  | 3 years |  |  |  |  |  | 3 years |  |
Issuance of ordinary shares to settle warrant exercised (in shares) | shares |  |  |  |  |  |  | 35,059,448 |  |  |  |  |  |  |  |  |
Proceeds from the exercise of ADS warrants |  |  |  |  |  |  | $ 203,200 |  |  |  |  |  |  |  |  |
Purchase of warrants (in shares) | shares |  |  |  |  |  |  | 19,898,829 | 24,014,728 |  |  |  |  |  | 24,014,728 |  |
Underwritten Offering | Pre-funded Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share (in dollars per share) | $ / shares | $ 7.9999 |  |  |  |  |  |  | $ 4.2649 |  |  |  |  |  |  |  |
Warrant exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.0001 |  |  |  |  |  |  |  |
Purchase of warrants (in shares) | shares | 1,250,000 |  |  |  |  |  | 19,898,829 | 11,044,720 |  |  |  |  |  | 11,044,720 |  |
Underwritten Offering | 2026 ADS Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ordinary share conversion ratio (in shares) | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, shares issued in transaction (in shares) | shares | 17,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share (in dollars per share) | $ / shares | $ 8.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
American Depositary Shares | Initial Public Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of stock that may be sold |  |  |  |  |  | $ 150,000 |  |  |  |  |  |  |  |  |  |
Amount authorized |  |  |  |  |  | $ 150,000 |  |  |  |  |  |  |  |  |  |
American Depositary Shares | At-The-Market Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount authorized |  |  |  |  |  |  |  |  |  |  |  | $ 150,000 |  |  |  |

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