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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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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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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Purchase price of common stock expressed as a percentage of its fair value.

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Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended	5 Months Ended	12 Months Ended
	May 31, 2021	Feb. 28, 2021	Mar. 31, 2024	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	May 28, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reserved shares of common stock for future issuance					33,213,670
Number of Shares, Granted					0
Issued and outstanding stock options					33,213,670
Share-Based Payment Arrangement, Expense					$ 43,726	$ 30,259	$ 18,928
Share based compensation arrangement by share based payment award options, Aggregate instrinsic value of stock options exercised					89,800	$ 56,100	$ 217,700
Share based compensation arrangement by share based payment award options, Weighted average grant date fair value of stock options granted						$ 30.08	$ 12.59
Gross proceeds from stock options exercised					10,400	$ 4,700	$ 6,900
Unrecognised compensation expense related to unvested RSUs, RSAs and ESPP					$ 11,100
Unrecognised compensation expense,expected to be recognised over a weighted average period					1 year 3 months 7 days
Number of outstanding common stock shares from employees acquired by existing investors		1,205,118
Stock based compensation expense							$ 8,400
Restricted Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognised compensation expense related to unvested RSUs, RSAs and ESPP					$ 89,400
Unrecognised compensation expense,expected to be recognised over a weighted average period					2 years 9 months 18 days
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reserved shares of common stock for future issuance					4,430,725
Issued and outstanding stock options					4,430,725
Restricted Stock Units (RSUs) [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option granted under plan,Vesting period					1 year
Restricted Stock Units (RSUs) [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option granted under plan,Vesting period					4 years
2018 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option granted under plan,Vesting period						4 years
Stock option granted under plan,Expiration period						10 years
2009 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option granted under plan,Vesting period					4 years
Stock option granted under plan,Expiration period					10 years
2021 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reserved shares of common stock for future issuance					14,846,817		19,988,330
Issued and outstanding stock options					14,846,817		19,988,330
Stock option granted under plan,Vesting period							4 years
Stock option granted under plan,Expiration period							10 years
Two Thousand and Twenty One Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reserved shares of common stock for future issuance								3,856,785
Issued and outstanding stock options								3,856,785
Unrecognised compensation expense related to unvested RSUs, RSAs and ESPP					$ 0
Share based compensation arrangement by share based payment award price at which common stock is purchased,Percent	85.00%
2021 ESPP [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reserved shares of common stock for future issuance					3,856,785
Recognized Compensation Expense			$ 1,200	$ 1,900	$ 700
Issued and outstanding stock options					3,856,785