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Share-based compensation - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Stock options
Beginning balance (in shares)	3,886,248	870,567
Granted options (in shares)	1,806,000	3,350,000
Exercised (in shares)	(25,954)	(2,053)
Forfeited (in shares)	(634,991)	(332,266)
Ending balance (in shares)	5,031,303	3,886,248
Weighted-Average per Share Exercise Price
Beginning balance (in dollars per share)	$ 9.72	$ 2.81
Granted (in dollars per share)	6.97	11.38
Exercised (in dollars per share)	2.81	2.81
Forfeited (in dollars per share)	8.54	8.37
Ending balance (in dollars per share)	$ 8.92	$ 9.72
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Options exercisable (in shares)	1,052,383
Options exercisable (in dollars per share)	$ 8.67

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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