Stock-Based Compensation - Summary of Company's stock option activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2026	Dec. 31, 2025
Stock Based Compensation [Line Items]
Number of Options, Beginning Balance	31,294,637
Number of Options, Granted	4,747,467
Number of Options, Exercised	(1,115,549)
Number of Options, Forfeited/Cancelled	(352,526)
Number of Options, Ending Balance	34,574,029	31,294,637
Number of Options, Exercisable	25,064,895
Weighted Avg Exercise Price, Beginning Balance	$ 0.66
Weighted Avg Exercise Price, Granted	13.22
Weighted Avg Exercise Price, Exercised	0.7
Weighted Avg Exercise Price, Forfeited/Cancelled	6.63
Weighted Avg Exercise Price, Ending Balance	2.33	$ 0.66
Weighted Avg Exercise Price, Exercisable	$ 0.65
Weighted Avg Remaining Contractual Life	6 years 10 months 28 days	6 years 3 months 14 days
Weighted Avg Remaining Contractual Life, Exercisable	6 years 1 month 24 days
Aggregate Intrinsic Value, Beginning Balance	$ 203,535
Aggregate Intrinsic Value, Ending Balance	274,381	$ 203,535
Aggregate Intrinsic Value, Exercised	$ 230,164

No definition available.

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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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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
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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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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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