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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Operating expenses:    
Research and development $ 73,922 $ 29,550
In-process research and development 10,848 71,745
General and administrative 22,616 7,957
Contribution of common stock to Erasca Foundation 17,497  
Total operating expenses 124,883 109,252
Loss from operations (124,883) (109,252)
Other income (expense)    
Interest income 190 336
Other income (expense), net 314 (102)
Change in fair value of preferred stock purchase right liability 1,615 7,358
Total other income (expense), net 2,119 7,592
Net loss $ (122,764) $ (101,660)
Net loss per share, basic and diluted $ (1.85) $ (4.83)
Weighted-average shares of common stock used in computing net loss per share, basic and diluted 66,290,592 21,037,540
Other comprehensive income (loss):    
Unrealized loss on investments, net $ (164) $ (9)
Comprehensive loss $ (122,928) $ (101,669)