Condensed Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities
Net loss	$ (88,355)	$ (4,080)
Adjustments to reconcile net loss to net cash used in operating activities:
Change in fair value of preferred stock tranche rights liability and preferred stock warrant liability	81,157
Stock-based compensation expense	253	77
Changes in operating assets and liabilities:
Grant receivable		30
Prepaid expenses and other current assets	(1,108)	406
Other assets	(13)	(270)
Accounts payable	741	380
Accrued expenses and other current liabilities	691	147
Net cash used in operating activities	(6,634)	(3,310)
Cash flows from investing activities
Purchase of fixed assets	(6)
Net cash used in investing activities	(6)
Cash flows from financing activities
Proceeds from issuance of Series B milestone shares, net of issuance costs	30,031
Payments for deferred offering costs	(220)
Net cash provided by financing activities	31,675
Net change in cash and cash equivalents	25,035	(3,310)
Cash and cash equivalents, at the beginning of the period	43,777	6,552
Cash and cash equivalents, at the end of the period	68,812	$ 3,242
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
Deferred offering costs in accounts payable	1,635
Deferred offering costs in accrued expenses and other current liabilities	497
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