Stock-based compensation - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning balance (in shares)	8,800,464
Granted (in shares)	2,302,270
Exercised (in shares)	(91,489)
Cancelled or forfeited (in shares)	(1,397,364)
Outstanding, ending balance (in shares)	9,613,881	8,800,464
Exercisable (in shares)	6,357,031
Weighted Average Exercise Price
Outstanding (in dollars per share)	$ 8.1
Granted (in dollars per share)	4.1
Exercised (in dollars per share)	2.92
Cancelled or forfeited (in dollars per share)	7.15
Outstanding (in dollars per share)	7.26	$ 8.1
Exercisable (in dollars per share)	$ 8.01
Remaining Contractual Life
Outstanding	6 years 9 months 18 days	7 years 3 months 18 days
Exercisable	5 years 9 months 18 days
Aggregate Intrinsic Value
Outstanding	$ 1,251	$ 3,462
Exercisable	973
Employee Stock Option
Options disclosures
Unrecognized stock-based compensation expense	$ 11,900
Remaining weighted-average remaining vesting period	2 years 3 months 18 days
Weighted average fair value of grants (in dollars per share)	$ 2.82	$ 5.45	$ 6.12

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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