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Stock-based Compensation - Summary of Share Options Outstanding (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number outstanding	15,449,513	15,955,892
Weighted average exercise price	$ 0.73	$ 0.71
Number of Options, exercisable	11,449,733
Weighted- Average Exercise price, exercisable	$ 0.68
Aggregate intrinsic value	$ 1
Range Of Exercise Price One [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Lower Range Limit	$ 0.15
Upper Range Limit	$ 0.86
Number outstanding	15,403,350
Weighted average remaining contractual term	6 years 1 month 13 days
Weighted average exercise price	$ 0.72
Aggregate intrinsic value	$ 107,517
Number of Options, exercisable	11,416,017
Weighted average remaining contractual term	5 years 3 months 14 days
Weighted- Average Exercise price, exercisable	$ 0.67
Aggregate intrinsic value	$ 80,243
Range Of Exercise Price Two [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Upper Range Limit	$ 1.87
Number outstanding	5,963
Weighted average remaining contractual term	9 years 10 days
Weighted average exercise price	$ 1.87
Aggregate intrinsic value	$ 35
Range Of Exercise Price Three [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Upper Range Limit	$ 2.10
Number outstanding	33,126
Weighted average remaining contractual term	2 years 8 months 8 days
Weighted average exercise price	$ 2.10
Aggregate intrinsic value	$ 186
Number of Options, exercisable	33,126
Weighted average remaining contractual term	2 years 8 months 8 days
Weighted- Average Exercise price, exercisable	$ 2.10
Aggregate intrinsic value	$ 186
Range Of Exercise Price Four [Member]
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Upper Range Limit	$ 9.07
Number outstanding	7,074
Weighted average remaining contractual term	9 years 11 months 12 days
Weighted average exercise price	$ 9.07
Number of Options, exercisable	590
Weighted average remaining contractual term	9 years 11 months 12 days
Weighted- Average Exercise price, exercisable	$ 9.07

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- Definition

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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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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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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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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