Condensed Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities
Net loss	$ (92,257)	$ (6,570)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	1
Change in fair value of preferred stock tranche rights liability and preferred stock warrant liability	81,157
Share-based compensation expense	557	116
Amortization of premiums on marketable securities, net	21
Non-cash interest income from marketable securities	(27)
Changes in operating assets and liabilities:
Grant receivable		(187)
Prepaid expenses and other current assets	(4,297)	461
Other assets	(13)	(378)
Accounts payable	(149)	1,231
Accrued expenses and other current liabilities	685	734
Net cash used in operating activities	(14,322)	(4,593)
Cash flows from investing activities
Purchases of available-for-sale marketable securities	(94,095)
Purchases of property and equipment	(14)
Net cash used in investing activities	(94,109)
Cash flows from financing activities
Proceeds from issuance of Series B milestone shares, net of issuance costs	30,031
Proceeds from issuance of common stock upon initial public offering, net of issuance costs	168,559
Proceeds from stock option exercises	2
Net cash provided by financing activities	200,456
Net change in cash and cash equivalents	92,025	(4,593)
Cash and cash equivalents at the beginning of the period	43,777	6,552
Cash and cash equivalents at the end of the period	135,802	$ 1,959
Supplemental disclosure of cash flow information
Cash paid for income taxes
Cash paid for interest
Supplemental disclosure of noncash financing activities
Reclassification of preferred stock tranche rights liability upon share issuance	81,190
Reclassification Of Warrant Liability Upon Exercise Of Preferred Stock Warrant	5,380
Conversion of convertible preferred stock into common stock upon initial public offering	174,504
Common Stock Warrants [Member]
Cash flows from financing activities
Proceeds from exercise of warrants	614
Series A -1 Convertible Preferred Stock Warrant Liability [Member]
Cash flows from financing activities
Proceeds from exercise of warrants	$ 1,250