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Related Party Transactions - Additional Information (Details) - USD ($)	1 Months Ended			12 Months Ended
	Dec. 31, 2021	Aug. 31, 2021	Jul. 31, 2021	Dec. 31, 2021
Related Party Transaction [Line Items]
Recovery of stockholder's short-swing profits		$ 553,000
Erasca Foundation
Related Party Transaction [Line Items]
Contribution of common stock				$ 17,497,000
Amount loaned in exchange of non-interest bearing promissory note	$ 100,000
Erasca Foundation | Prepaid Expenses and Other Current Assets
Related Party Transaction [Line Items]
Amount receivable	$ 100,000			$ 100,000
Common Stock | Erasca Foundation
Related Party Transaction [Line Items]
Stock issued			1,093,557	1,093,557
Contribution of common stock			$ 17,500,000

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