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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 3 Months Ended
--- | --- | --- | ---
Jan. 01, 2021 | Jun. 27, 2018 | Mar. 31, 2021 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Payment Arrangement, Expense |  |  | $ 7,520 | $ 4,540
Probable Performance Based [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Payment Arrangement, Expense |  |  | 600 |
Performance Based [Member] | Non Probable Performance Based And Service Based [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense related to unvested options |  |  | 4,100 |
Performance Based [Member] | Probable Performance Based And Service Based [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense related to unvested options |  |  | $ 52,400 |
Compensation expense, expected recognition period |  |  | 3 years 4 months 24 days |
Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options expiration period |  |  | 10 years |
Service Based Restricted Stock Units (RSUs) [Member] | Employees [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Granted, shares |  |  | 260,933 |
Aggregate grant date fair value of options |  |  | $ 12,300 |
Service Based and Performance Based RSUs [Member] | Employees [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Granted, shares |  |  | 26,788 |
Aggregate grant date fair value of options |  |  | $ 1,300 |
2018 Equity Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation, common stock available for grant |  |  | 2,414,810 |
Share-based Compensation, number of additional shares available for issuance | 1,410,678 |  |  |
2018 Equity Incentive Plan [Member] | Class A Common Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation, common stock available for grant |  | 2,149,480 |  |
2018 Equity Incentive Plan [Member] | Class A Common Stock [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation, common stock available for grant |  | 5,028,832 |  |
Annual increase in shares authorized |  | 2,500,000 |  |
2018 Equity Incentive Plan [Member] | Class A Common Stock and Class B Common Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation, number of additional shares available from 2008 Stock Incentive Plan |  | 583,056 |  |
2018 Equity Incentive Plan [Member] | Class A Common Stock and Class B Common Stock [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Annual percentage increase in shares authorized |  | 5.00% |  |

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- Definition The automatic increase in the number of shares that may be issued under a share-based payment arrangement on the first day of each fiscal year. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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