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	$ (95,402)	$ (35,853)	$ (29,855)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,330	1,008	860
Loss on disposal of property and equipment	4	0	3
Change in fair value of derivative liability	0	1,581	63
Change in fair value of profits interest liability	0	(6,852)	(6,403)
Loss/(gain) on extinguishment of debt	(690)	2,883	0
Stock-based compensation	25,117	3,022	0
Non-cash interest	0	525	355
Accrued interest	3	864	1,276
Deferred rent	0	(150)	230
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(237)	(1,273)	939
Accounts payable and accrued expenses	7,992	(1,660)	3,218
Accounts payable and accrued expenses—related parties	0	0	(88)
Deferred revenue	0	(429)	19,757
Right-of-use assets and lease liabilities, net	(331)	0	0
Net cash used in operating activities	(62,214)	(36,334)	(9,645)
Cash flows from investing activities
Purchases of property and equipment	(924)	(590)	(1,509)
Net cash used in investing activities	(924)	(590)	(1,509)
Cash flows from financing activities
Noncontrolling interest	0	(19)	(5)
Proceeds from issuance of convertible debt	0	2,750	4,000
Proceeds from issuance of convertible preferred stock, net of issuance costs	0	68,183	0
Proceeds from issuance of PPP loan	0	682	0
Proceeds from initial public offering, net of issuance costs	0	200,229	0
Payment of initial public offering costs	(1,911)	0	0
Proceeds from issuance of common stock	70,994	0	0
Proceeds from exercise of stock options	140	0	0
Proceeds from issuance of common stock under Employee Stock Purchase Plan	289	0	0
Net cash provided by financing activities	69,512	271,825	3,995
Net increase (decrease) in cash and cash equivalents	6,374	234,901	(7,159)
Cash and cash equivalents, beginning of period	238,605	3,704	10,863
Cash and cash equivalents, end of period	244,979	238,605	3,704
Supplemental disclosure of non-cash investing and financing activities
Property and equipment additions included in accounts payable and accrued expenses	1	17	172
Fair value of warrants issued by affiliates in connection with modification of convertible promissory notes	0	0	764
Assumption of profits interest liability by affiliates	0	991	997
Equity issuance costs included in accounts payable and accrued expenses	0	1,911	0
Carrying value of convertible promissory notes settled in connection with Corporate Reorganization	0	27,711	0
Fair value of consideration issued in connection with settlement of convertible promissory notes	0	30,594	0
Tax related to net settlement of equity awards included in accounts payable and accrued expenses	$ 291	$ 0	$ 0