Stock-based compensation - Stock Options Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2022	Dec. 31, 2021
Number of options outstanding
Balance (in shares)	16,336,134
Granted (in shares)	0
Exercised (in shares)	(174,378)
Forfeited (in shares)	(840,002)
Expired (in shares)	(11,077)
Balance (in shares)	15,310,677	16,336,134
Unvested (in shares)	4,698,271
Exercisable (in shares)	10,612,406
Weighted average exercise price ($)
Balance (in usd per share)	$ 0.81
Granted (in usd per share)	0
Exercised (in usd per share)	0.81
Forfeited (in usd per share)	0.81
Expired (in usd per share)	0.81
Balance (in usd per share)	0.81	$ 0.81
Unvested (in usd per share)	0.81
Exercisable (in usd per share)	$ 0.81
Weighted average remaining contractual term (years)
Balance	7 years 11 months 15 days	8 years 6 months 18 days
Unvested	7 years 9 months 7 days
Exercisable	7 years 5 months 4 days
Aggregate intrinsic value ($)
Balance	$ 80,179	$ 75,144
Unvested	73,479
Exercisable	$ 52,098

Share Based Compensation Arrangement By Share Based Payment Award, Aggregate Intrinsic Value

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Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Intrinsic Value

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Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Nonvested, Weighted Average Remaining Contractual Term

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Share Based Compensation Arrangement By Share Based Payment Award, Weighted Average Remaining Contractual Term

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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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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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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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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 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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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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Number of non-vested options outstanding.

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Weighted average grant-date fair value of non-vested options outstanding.

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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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