Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities
Net loss	$ (72,950,000)	$ (26,651,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation expense	117,000	0
Change in fair value of preferred stock tranche liability		17,030,000
Research and development license expense	5,500,000	3,000,000
Stock-based compensation	8,143,000
Other	194,000
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(3,282,000)	(9,000)
Accounts payable	2,382,000	1,237,000
Accrued expenses and other liabilities	15,053,000	1,214,000
Due to related party	(8,000)	14,000
Net cash used in operating activities	(44,851,000)	(4,165,000)
Cash flows from investing activities
Purchase of research and development license	(5,500,000)	(3,000,000)
Purchase of property, plant and equipment	(3,532,000)
Net cash used in investing activities	(9,032,000)	(3,000,000)
Cash flows from financing activities
Proceeds from issuances of Series A convertible preferred stock		18,600,000
Payment of Series A convertible preferred stock issuance costs		(263,000)
Proceeds from note payable to related party		1,673,000
Repayment of note payable to related party		(1,645,000)
Net cash provided by financing activities		18,365,000
Net (decrease) increase in cash and cash equivalents	(53,883,000)	11,200,000
Cash at the beginning of the period	251,253,000
Cash at the end of the period	197,370,000	11,200,000
Supplemental disclosure of cash flow information:
Cash paid for interest		27,000
Supplemental disclosure of noncash investing and financing activities:
Property, plant and equipment in accounts payable and accrued expenses	3,308,000	19,000
Acquisition of property, plant and equipment funded by landlord	606,000
Build-to-suit lease liability	$ 26,250,000
Deferred offering costs not yet paid		90,000
Reclassification of preferred stock tranche liability		904,000
Allocation of preferred stock tranche liability		1,050,000
Series A convertible preferred stock issuance costs not yet paid		$ 177,000