Common stock fair value per share.

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Common stock value per share.

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Number of tranches.

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Share based compensation arrangement by share based payment award equity instruments other than fair value.

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Share based compensation arrangement by share based payment award performance period.

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Share-based compensation arrangement by share-based payment award trading period.

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Stock issued during period shares related to early settlement of bonus escrow.

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Number of shares of equity interests issued or issuable to acquire entity.

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Aggregate number of common shares reserved for future issuance.

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights.

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The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Discount rate from fair value on purchase date that participants pay for shares.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The estimated measure of the 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.

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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.

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Stockholders' Equity - Additional Information (Detail)				1 Months Ended	3 Months Ended	12 Months Ended
Stockholders' Equity - Additional Information (Detail)	May 11, 2022 shares	Aug. 27, 2021 shares	Aug. 09, 2021 shares	Aug. 31, 2021 $ / shares shares	Mar. 31, 2022 shares	Dec. 31, 2023 USD ($) Tranche $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) shares	Sep. 30, 2020 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Preferred stock authorized						100,000,000	100,000,000		100,000,000
Preferred stock per share \| $ / shares						$ 0.01	$ 0.01		$ 0.01
Dividends Declared \| $						$ 0
Preferred stock, shares issued						0	0
Preferred stock, shares outstanding						0	0
Common stock authorized						1,300,000,000
Common stock reserve for issuance						74,506,099	68,617,245
Exercise of common stock options \| $						$ 569,000	$ 5,666,000	$ 20,880,000
Common Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise of common stock options \| $						3,000	27,000	66,000
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of RSU's granted \| $						39,419,000	63,987,000	152,550,000
Aggregate intrinsic value of restricted stock units vested \| $						$ 18,773,000	$ 22,218,000	$ 90,726,000
Performance-based Market Condition Share Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share price \| $ / shares						$ 2.76	$ 3.5
Expected volatility						70.00%	75.00%
Fair value of RSU's granted \| $						$ 5,805,000	$ 63,157,000
Number of Unvested shares						26,716,306	25,602,405
Performance period						3 years
Shares, granted						2,654,598		0
Performance-based Market Condition Share Awards [Member] \| Management [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Trading period						30 days
Number of tranches \| Tranche						3
Number of Unvested shares						1,146,310
Performance-based Market Condition Share Awards [Member] \| Maximum [Member] \| Management [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Unvested shares						2,654,598
2020 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option vesting period						4 years
Stock option expiration period						10 years
Shares available for grant						8,454,180
Aggregate intrinsic value of stock options exercised \| $						$ 206,000	$ 5,167,000	$ 106,407,000
Stock options, granted						0	0	0
Exercise of common stock options \| $						$ 569,000	$ 5,740,000	$ 20,806,000
2020 Employee Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, discount from market price, purchase date						85.00%
Shares, issued under ESPP						1,224,312	703,148	178,021
Shares available for issuance						6,923,669
Equity Award Plan [Member] \| Common Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock-based compensation \| $						$ 65,125,000
Weighted-average period						2 years 2 months 12 days
Conversa [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate merger consideration, shares				4,700,000			1,000,000
Common stock fair value per share \| $ / shares				$ 11.20			$ 4.21
Silver Cloud Health Holdings, Inc. [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate merger consideration, shares				8,100,000			5,000,000
Common stock fair value per share \| $ / shares				$ 10.51			$ 2.61
Common Class A [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock per share \| $ / shares						$ 0.01	$ 0.01		$ 0.01
Common stock authorized						1,000,000,000	1,000,000,000		1,000,000,000
Common stock, voting rights						one
Common stock per share \| $ / shares						$ 2,548
Common Class A [Member] \| Conversa [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate merger consideration, shares			4,700,000		1,020,964
Common Class A [Member] \| Silver Cloud Health Holdings, Inc. [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate merger consideration, shares	4,959,856	8,100,000
Common Class A [Member] \| SilverCloud Bonus Escrow [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares related to early settlement of bonus escrow							600,000
Common Class C [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock per share \| $ / shares						$ 0.01	$ 0.01		$ 0.01
Common stock authorized						200,000,000	200,000,000		200,000,000
Common stock, voting rights						one
Common stock per share \| $ / shares						$ 56
Common Class B [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock per share \| $ / shares						$ 0.01	$ 0.01		$ 0.01
Common stock authorized						100,000,000	100,000,000		100,000,000
Common stock, voting rights						(x) 1.0408163 and (y) the total number of votes that would be cast at such time by the holders of the Class A and Class C common stock and any other preferred stock entitled to vote under the certificate of incorporation at such time (resulting in the Class B common stock collectively holding 51% of the total outstanding voting power)
Number of shares converted						0
Common stock per share \| $ / shares						$ 275