Stock-based compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Share-based Payment Arrangement [Abstract]
Balances as of December 31, 2020	1,249,218
Granted	1,157,074
Exercised	(687,503)
Forfeited	(30,000)
Balances as of December 31, 2021	1,688,789	1,249,218
Exercisable and vested at December 31, 2021	493,459
Balances as of December 31, 2020	$ 1.86
Granted	12.09
Exercised	1.86
Forfeited	12.20
Balances as of December 31, 2021	8.69	$ 1.86
Options vested and expected to vest at December 31, 2021	$ 7.26
Options Outstanding Weighted Average Contractual Life (years)	9 years	9 years 9 months 18 days
Options Exercisable Weighted Average Contractual Life (years)	8 years 10 months 24 days
Options Outstanding Intrinsic Value	$ 1,225
Options Outstanding Intrinsic Value	1,651	$ 1,225
Options Vested and Expected to Vest Intrinsic Value	$ 771

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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 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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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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-Publisher FASB
-Name Accounting Standards Codification
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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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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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