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Stock-Based Compensation - Schedule of Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Number of Options Outstanding, Beginning Balance	17,624
Number of Options, Granted	998
Number of Options, Exercised	(97)
Number of Options, Forfeited/Expired	(2,278)
Number of Options Outstanding, Ending Balance	16,247	17,624
Number of Options, Exercisable	9,378
Weighted-Average Exercise Price per Option Outstanding, Beginning Balance	$ 5.94
Weighted-Average Exercise Price per Option, Granted	4.2
Weighted-Average Exercise Price per Option, Exercised	3.65
Weighted-Average Exercise Price per Option, Forfeited/Expired	6.63
Weighted-Average Exercise Price per Option Outstanding, Ending Balance	5.75	$ 5.94
Weighted-Average Exercise Price per Option, Exercisable	$ 6.61
Weighted-Average Remaining Contractual Term, Outstanding Balance	6 years 4 months 24 days	6 years 1 month 6 days
Weighted-Average Remaining Contractual Term, Exercisable	5 years 8 months 12 days
Aggregate Intrinsic Value, Outstanding Balance	$ 9.4	$ 6.9
Aggregate Intrinsic Value, Exercisable	$ 3.4

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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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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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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 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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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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