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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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