Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net loss	$ (72,754)	$ (43,843)	$ (16,984)
Adjustments to reconcile net loss to net cash used in operating activities:
Acquired in-process research and development assets	8,000	0
Share-based compensation expense	13,321	526	111
Depreciation and amortization expense	20	16	0
Amortization of operating right-of-use assets	179	139
Non-cash interest expense	0	30	2,077
Issuance of shares for research and development	0		9,837
Changes in derivative tranche liabilities	0	30,000	0
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(3,717)	(1,336)	(4)
Deposits and other long-term assets	(62)	(107)	0
Accounts payable	1,542	132	14
Accrued expenses and other current liabilities	5,114	1,127	434
Operating lease liabilities	(182)	(173)
Net cash used in operating activities	(48,539)	(13,489)	(4,515)
Cash flows from investing activities
Purchases of property and equipment	0	(92)	0
Cash paid for acquired in-process research and development assets	(8,000)	0	0
Cash used in investing activities	(8,000)	(92)	0
Cash flows from financing activities
Proceeds from issuance of convertible notes	0	0	1,000
Proceeds from issuance of common stock, net	167,045		0
Proceeds from issuance of common stock upon ESPP purchase	318		0
Net cash provided by financing activities	297,120	29,977	30,905
Cash and Cash Equivalents, Period Increase (Decrease), Total	240,581	16,396	26,390
Cash and cash equivalents, beginning of period	43,728	27,332	942
Cash and cash equivalents, end of period	284,309	43,728	27,332
Supplemental disclosures of noncash activities
Recognition of contingent beneficial conversion feature upon notes conversion	0	0	2,000
Issuance of Series A redeemable convertible shares for research and development	0	0	9,857
Conversion of convertible notes and accrued interest into Series A redeemable convertible preferred shares	0	0	2,082
Issuance of derivative tranches liability	0	0	1,483
Transfers to redeemable convertible noncontrolling interest	0	3,551	0
Right of use asset capitalization	0	545	0
Exchange of 45,331,483 preferred, common, and incentive shares in connection with the Conversion (Note 1)	224,892	0	0
Exchange of redeemable convertible noncontrolling interest to 6,470,382 shares of common stock (Note 13)	3,592	0	0
Series A Preferred Stock [Member]
Cash flows from financing activities
Proceeds from issuance of redeemable convertible preferred shares, net of issuance costs	0	29,977	29,905
Series B Preferred Stock [Member]
Cash flows from financing activities
Proceeds from issuance of redeemable convertible preferred shares, net of issuance costs	$ 129,757	$ 0	$ 0