Share-Based Compensation - Schedule of Assumptions Used to Estimate Fair Value of Stock Options Granted (Detail) - $ / shares	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
2014 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate of return, minimum	2.20%	1.64%	1.22%
Risk-free interest rate of return, maximum	4.86%	1.96%	1.48%
Expected term	6 years	6 years	6 years
Volatility, minimum	50.30%	50.20%	50.60%
Volatility, maximum	57.80%	51.80%	54.40%
Dividend yield	0.00%	0.00%	0.00%
Exercise price	$ 0.0002	$ 0.0002	$ 0.0002
2018 Plan \| Options classified as Equity Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate of return, minimum	4.40%	2.04%	1.52%
Risk-free interest rate of return, maximum	4.40%	2.04%	1.83%
Expected term	10 years	10 years	10 years
Volatility, minimum	56.20%	59.00%	53.80%
Volatility, maximum	56.20%	59.00%	57.10%
Dividend yield	0.00%	0.00%	0.00%
2018 Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price		$ 0.002	$ 0.002
2018 Plan \| Minimum \| Options classified as Equity Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price	$ 0.0001
2018 Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price		$ 5	$ 5

Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

No definition available.

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- Definition

The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

No definition available.

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- Definition

The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

No definition available.

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- Definition

The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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