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Stockholders' Equity - Additional Information (Detail) |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
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 |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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