Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity Deficit - USD ($) $ in Thousands	Total	Initial Public Offering	Series A Redeemable Convertible Preferred Stock	Series A Redeemable Convertible Preferred Stock Initial Public Offering	Series B Redeemable Convertible Preferred Stock	Series B Redeemable Convertible Preferred Stock Initial Public Offering	Common Stock	Common Stock License Agreement with Stanford	Common Stock Initial Public Offering	Additional Paid in Capital	Additional Paid in Capital Initial Public Offering	Accumulated Deficit
Beginning balance at Dec. 31, 2019	$ (2,218)											$ (2,218)
Common stock issued to founders and investor							8,548,517
Issuance of restricted common shares, Shares							832,983
Issuance of redeemable convertible preferred stock upon conversion of outstanding related party convertible note and accrued interest			$ 5,020
Issuance of redeemable convertible preferred stock upon conversion of outstanding related party convertible note and accrued interest, Shares			5,019,945
Related party convertible note and accrued interest cancellation	2,225									$ 2,225
Common stock issued upon early exercise of options, Shares							897,602
Issuance of redeemable convertible preferred stock for cash			$ 21,488
Issuance of redeemable convertible preferred stock for cash, Shares			25,000,000
Reclassification of tranche liability upon settlement			$ 29,100
Obligation to issue common stock shares for license	2,772									2,772
Stock-based compensation expense	177									177
Vesting of early exercised stock options	9									9
Net loss and comprehensive loss	(68,373)											(68,373)
Ending balance at Dec. 31, 2020	(65,408)									5,183		(70,591)
Temporary equity, Ending balance, Shares at Dec. 31, 2020			30,019,945
Temporary equity, Ending balance at Dec. 31, 2020			$ 55,608
Ending balance, Shares at Dec. 31, 2020							10,279,102
Common stock issued upon exercise of options	42									42
Common stock issued upon exercise of options, Shares							33,906
Common stock issued upon early exercise of options, Shares							918,825
Common stock issued under ESPP	306									306
Common stock issued under ESPP, Shares							39,894
Issuance of redeemable convertible preferred stock for cash			$ 14,997		$ 150,524
Issuance of redeemable convertible preferred stock for cash, Shares			15,000,000		29,792,487
Reclassification of tranche liability upon settlement			$ 39,403
Issuance of common stock		$ 251,323									$ 251,323
Issuance of common stock, Shares								640,861	16,100,000
Repurchase of common stock in connection with License Agreement with Stanford, Shares								(624,845)
Conversion of redeemable convertible preferred stock to common stock at closing of initial public offering		$ 260,532							$ 1		$ 260,531
Temporary equity, Conversion of redeemable convertible preferred stock to common stock at closing of initial public offering, Shares				(45,019,945)		(29,792,487)
Temporary equity, Conversion of redeemable convertible preferred stock to common stock at closing of initial public offering				$ (110,008)		$ (150,524)
Conversion of redeemable convertible preferred stock to common stock at closing of initial public offering, Shares									30,761,676
Stock-based compensation expense	7,871									7,871
Vesting of early exercised stock options	144									144
Repurchase of unvested early exercised stock options, Shares							(138,596)
Net loss and comprehensive loss	(70,760)											(70,760)
Ending balance at Dec. 31, 2021	$ 384,050						$ 1			$ 525,400		$ (141,351)
Temporary equity, Ending balance, Shares at Dec. 31, 2021			0
Ending balance, Shares at Dec. 31, 2021							58,010,823