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Capital structure - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 27, 2022 | Aug. 31, 2019 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | May 31, 2021
Common stock |  |  |  |  |  |  |
Number of shares issued in transaction (in shares) |  |  | 0 | 0 | 0 |  |
Common stock, authorized shares (in shares) |  |  | 250,000,000 | 250,000,000 |  | 250,000,000 | 125,000,000
Maximum |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |
Aggregate value of remaining shares to be issued and sold |  |  | $ 93.0 |  |  |  |
Stock Purchase Agreement |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |
Net consideration received on transaction | $ 50.0 |  |  |  |  |  |
Number of shares issued in transaction (in shares) | 1,095,290 |  |  |  |  |  |
Price per share (in USD per share) | $ 45.65 |  |  |  |  |  |
Number of days within which to register stock sale with the SEC per terms of the agreement | 60 days |  |  |  |  |  |
Period of time from the closing date that the entity agrees to keep the stock sale registration effective | 6 months |  |  |  |  |  |
Period of time from the closing date that the purchaser agrees not to resell or transfer entity's stock without written approval | 90 days |  |  |  |  |  |
Censa |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |
Development milestone obligation payments made |  |  | $ 30.0 |  |  |  |
Shares issued for milestone payment |  |  | 657,462 |  |  |  |
Development milestone obligation cash payments made |  |  | $ 0.4 |  |  |  |
Sales Agreement | Common stock | Maximum |  |  |  |  |  |  |
Common stock |  |  |  |  |  |  |
Net consideration received on transaction |  | $ 125.0 |  |  |  |  |

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