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Stock-based compensation - Stock Option Rollforward (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Number of Options
Beginning balance (in shares)	17,104,505
Granted (in shares)	3,970,309
Exercised (in shares)	(542,741)
Canceled/Forfeited (in shares)	(225,111)
Expired (in shares)	(40,087)
Ending balance (in shares)	20,266,875	17,104,505
Exercisable (in shares)	5,926,599
Weighted Average Exercise Price per Share
Beginning balance (in usd per share)	$ 3.03
Granted (in usd per share)	4.38
Exercised (in usd per share)	2.68
Canceled/Forfeited (in usd per share)	2.59
Expired (in usd per share)	5.11
Ending balance (in usd per share)	3.31	$ 3.03
Exercisable, weighted average price (in usd per share)	$ 3.66
Weighted Average Remaining Contractual Term (in years)	8 years 6 months	8 years 3 months 18 days
Exercisable, weighted average remaining contractual term (in years)	7 years 1 month 6 days
Intrinsic value, shares outstanding	$ 55,369	$ 30,661
Intrinsic value, exercised	1,233
Exercisable, aggregate intrinsic value	$ 16,497

X

- Definition

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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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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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 price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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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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