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Stockholders' Equity - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2020
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 | $ 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 | 4,622,750 | 3,725,304 |  |
Exercise of common stock options |  | $ 569,000 | $ 5,666,000 |
Common Stock [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Exercise of common stock options |  |  | $ 1,000 |
Exercise of common stock options, Shares |  | 14,329 | 134,515 |
Restricted Stock [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Fair value of stock granted | $ 37,010,000 | $ 39,419,000 | $ 63,987,000 |
Aggregate intrinsic value of restricted stock units vested | $ 13,744,000 | 18,773,000 | 22,218,000 |
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Cancelled shares | 422,319 |  |  |
Shares issued | 595,462 |  |  |
Shares, granted | 1,903,463 |  |  |
Performance-based Market Condition Share Awards [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Fair value of stock granted |  | 5,805,000 | 63,157,000 |
Shares, granted | 0 |  |  |
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 | 771,730 |  |  |
Aggregate intrinsic value of stock options exercised | $ 0 | $ 206,000 | $ 5,167,000 |
Stock options, granted | 0 | 0 | 0 |
Exercise of common stock options |  | $ 569,000 | $ 5,740,000 |
Exercise of common stock options, Shares | 0 |  |  |
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 | 115,527 | 61,216 | 35,168 |
Shares available for issuance | 329,741 |  |  |
Equity Award Plan [Member] | Common Stock [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Unrecognized stock-based compensation | $ 29,672,000 |  |  |
Weighted-average period | 1 year 10 months 24 days |  |  |
Conversa [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Aggregate merger consideration, shares |  |  | 1,000,000 |
Common stock fair value per share |  |  | $ 4.21 |
Silver Cloud Health Holdings, Inc. [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Aggregate merger consideration, shares |  |  | 5,000,000 |
Common stock fair value per share |  |  | $ 2.61 |
Common Class A [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Common stock per share | $ 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 | $ 139 |  |  |
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 | $ 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 | $ 3 |  |  |
Common Class B [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Common stock per share | $ 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 | $ 14 |  |  |

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