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v3.21.1

Nature of Business and Basis of Presentation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 20, 2020 | Jul. 08, 2020 | Jan. 31, 2021 | Dec. 31, 2020 | Jul. 07, 2020 | Dec. 31, 2019
Nature of Business and Basis of Presentation [Line Items] |  |  |  |  |  |
Accumulated deficit |  |  |  | $ (404,228) |  | $ (189,482)
Number of shares issued in transaction | 23,000,000 |  |  |  |  |
Sale price of stock | $ 20.00 |  |  |  |  |
Issuance of common stock in public offering | $ 425,293 |  |  | 425,293 |  |
Underwriting discounts and commissions | 32,200 |  |  |  |  |
Expense on initial public offering | $ 2,507 |  |  | $ 2,507 |  |
Conversion of stock shares converted | 61,992,534 |  |  |  |  |
Common stock shares authorized |  | 150,000,000 |  | 150,000,000 | 260,000,000 | 260,000,000
Stockholders' Equity, Reverse Stock Split |  | one-for-3.55092 |  |  |  |
Genentech [Member] | Subsequent Event [Member] | Collaboration and License Agreement [Member] |  |  |  |  |  |
Nature of Business and Basis of Presentation [Line Items] |  |  |  |  |  |
Upfront payment received |  |  | $ 75,000 |  |  |

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