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Equity Plans and Stock-Based Compensation - Narrative (Detail) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | May 31, 2024 | Jun. 30, 2021 | May 31, 2021 | Jan. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Increase in aggregate number of shares of common stock authorized for issuance |  |  |  |  |  | 1,000,000 |
Options vesting period | 3 years |  |  |  |  |  |
Expected dividend yield | 0.00% | 0.00% | 0.00% |  |  |  |
Employee Stock Option |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Options vesting period | 7 years |  |  |  |  |  |
Stock-based compensation plans | $ 17.1 | $ 18.7 | $ 17.2 |  |  |  |
Intrinsic value of options exercised | 2.9 | 5.0 | 7.7 |  |  |  |
Fair value of stock options vested | 17.5 | 19.5 | 17.5 |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock based compensation expense related to restricted stock | 28.7 | 20.4 | 13.2 |  |  |  |
Aggregate intrinsic value | 68.5 | 62.2 | 37.0 |  |  |  |
Fair value of restricted stock units | $ 24.3 | $ 16.1 | 15.7 |  |  |  |
Restricted stock unit awards outstanding | 5,363,000 | 4,445,000 |  |  |  |  |
Market-Based Performance Stock Units |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Stock based compensation expense related to restricted stock | $ 5.7 | $ 2.5 | 0.8 |  |  |  |
Aggregate intrinsic value | $ 14.2 | $ 7.8 | $ 2.1 |  |  |  |
Restricted stock unit awards outstanding | 1,115,000 | 557,000 |  |  |  |  |
Maximum | Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Expiration period | 10 years |  |  |  |  |  |
Minimum | Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Expiration period | 7 years |  |  |  |  |  |
2018 Equity Incentive Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Newly reserved shares of common stock | 14,122,413 |  |  |  | 3,250,000 |  | 1,500,000
Increase in aggregate number of shares of common stock authorized for issuance |  |  |  | 11,400,000 |  |  |
Shares remaining available for future purchases |  |  |  | 41,440,250 |  |  |
2014 Employee Stock Purchase Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation cost related to non-vested equity awards | $ 0.4 |  |  |  |  |  |
Unrecognized compensation cost, weighted-average vesting period | 1 year 4 months 24 days |  |  |  |  |  |
Shares issued to employees | 184,000 |  |  |  |  |  |
Shares remaining available for future purchases | 538,000 |  |  |  |  |  |
2014 Employee Stock Purchase Plan | The commencement of the offer period (generally, the sixteenth day in February or August) |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Purchase price per share as percentage of fair market value of common stock | 85.00% |  |  |  |  |  |
Purchase price of common stock, offering period | 2 years |  |  |  |  |  |
2014 Employee Stock Purchase Plan | The exercise date, which is the last day of a purchase period (generally, the fifteenth day in February or August) |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Purchase price per share as percentage of fair market value of common stock | 85.00% |  |  |  |  |  |
2014 Employee Stock Purchase Plan | Maximum |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Shares remaining available for future purchases |  |  |  |  |  | 1,850,000 |
Performance Based Vesting Schedule | Performance Based Restricted Stock Units |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock unit awards outstanding | 36,000 |  |  |  |  |  |
Time Based Vesting Schedule |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation cost related to non-vested equity awards | $ 50.0 |  |  |  |  |  |
Unrecognized compensation cost, weighted-average vesting period | 1 year 8 months 12 days |  |  |  |  |  |
Time Based Vesting Schedule | Performance Based Restricted Stock Units |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation cost related to non-vested equity awards | $ 9.2 |  |  |  |  |  |

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