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Stockholders' equity - Narrative (Details) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 14, 2023 | Jun. 30, 2026 USD ($) $ / shares shares | Jun. 30, 2025 USD ($) shares | Jun. 30, 2026 USD ($) $ / shares shares | Jun. 30, 2025 USD ($) shares | Feb. 11, 2026 $ / shares | Dec. 31, 2025 $ / shares shares
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Conversion ratio | 0.1 |  |  |  |  |  |
2025 2-Year Warrants |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Number of warrants exercised (in shares) |  | 6,779,910 |  | 6,779,910 |  |  |
Warrants, exercise price (in dollars per share) | $ / shares |  | $ 6.000 |  | $ 6.000 |  |  | $ 6.000
Proceeds from warrant exercises | $ |  |  |  | $ 40.7 |  |  |
2025 3-Year Warrants |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Number of warrants exercised (in shares) |  | 662,483 |  | 662,483 |  |  |
Warrants, exercise price (in dollars per share) | $ / shares |  | $ 4.200 |  | $ 4.200 |  |  | 4.200
Proceeds from warrant exercises | $ |  |  |  | $ 2.8 |  |  |
Class of warrant or right, warrants exercised (in shares) |  | 1,000 |  |  |  |  |
Private Placement Offering Warrants |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Number of warrants exercised (in shares) |  | 10,008,240 |  | 10,008,240 |  |  |
Warrants, exercise price (in dollars per share) | $ / shares |  | $ 1.0680 |  | $ 1.0680 |  |  | $ 1.068
Number of securities called by warrants (in shares) |  | 1,000,824 |  | 1,000,824 |  |  |
Number of securities called by each warrant (in shares) |  | 0.1 |  | 0.1 |  |  | 0.1
Share price, ten day average (in dollars per share) | $ / shares |  |  |  |  |  | $ 45.41 |
Common stock issued (in shares) |  |  |  | 765,440 |  |  |
New At-The-Market Offering |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Number of shares issued (in shares) |  | 1,476,538 | 0 | 1,476,538 | 108,072 |  |
Proceeds from issuance of equity | $ |  | $ 35.8 | $ 0.0 | $ 35.8 | $ 0.3 |  |
Shares available for issuance under the plan | $ |  | $ 55.3 |  | $ 55.3 |  |  |

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