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Fair Value Measurements - Summary of Estimated Fair Value of Success Payment Liability Assumptions (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Fred Hutch    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value of common stock Series A convertible preferred stock $ 14.80 $ 9.07
Fred Hutch | Risk-Free Interest Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Risk-free interest rate minimum 0.07 0.10
Risk-free interest rate maximum 2.24 1.52
Fred Hutch | Expected Volatility    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Expected volatility 75.00% 80.00%
Fred Hutch | Expected Term | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Expected term (in years) 8 months 15 days 1 year
Fred Hutch | Expected Term | Maximum [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Expected term (in years) 6 years 2 months 19 days 6 years 11 months 19 days
Stanford    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value of common stock Series A convertible preferred stock $ 14.80 $ 9.07
Stanford | Risk-Free Interest Rate    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Risk-free interest rate minimum 0.07 0.10
Risk-free interest rate maximum 2.24 1.53
Stanford | Expected Volatility    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Expected volatility 75.00% 80.00%
Stanford | Expected Term | Minimum    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Expected term (in years) 8 months 15 days 1 year
Stanford | Expected Term | Maximum [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Expected term (in years) 8 years 8 years 9 months