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Share-Based Payments - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Aug. 01, 2020 | Jul. 08, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total share-based compensation expense |  | $ 31,960 | $ 4,456 |  |
Share-based compensation arrangement by share-based payment award, vesting term |  | 4 years |  |  |
Weighted average grant date fair value of stock options granted |  | $ 30.14 | $ 3.34 |  |
Total unrecognized compensation cost related to the unvested stock-based awards, Value |  | $ 69,948 |  |  |
Total unrecognized compensation cost related to the unvested stock-based awards, Weighted average period |  | 2 years 7 months 9 days |  |  |
Operating Income (Loss) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total share-based compensation expense |  | $ 25,527 |  |  |
2020 Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Payment Award, Number of Shares Authorized |  | 8,026,772 |  | 0 | 8,376,080
2016 Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Payment Award, Number of Shares Authorized |  |  |  | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Purchased for Award | 1,960,547 |  |  |  |
Share-based Payment Award, Award Vesting Rights |  | The commencement of vesting was based on the achievement of certain scientific and operational milestones during a two-year period, for which the achievement was discretionary and subject to the approval of the Company’s board of directors. |  |  |

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