Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities
Net loss	$ (72,012)	$ (19,458)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,016	716
Loss on disposal of property and equipment	4	0
Change in fair value of derivative liability	0	1,581
Change in fair value of profits interest liability	0	(7,625)
Loss (Gain) on extinguishment of debt	(690)	2,883
Stock-based compensation	21,307	0
Non-cash interest	0	525
Accrued interest	3	862
Deferred rent	(221)	(101)
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(1,516)	25
Accounts payable and accrued expenses	10,844	1,307
Deferred revenue	0	(429)
Net cash used in operating activities	(41,265)	(22,328)
Cash flows from investing activities
Purchases of property and equipment	(835)	(195)
Net cash used in investing activities	(835)	(195)
Cash flows from financing activities
Noncontrolling interest	0	(19)
Proceeds from issuance of convertible debt	0	2,750
Proceeds from issuance of convertible preferred stock, net of issuance costs	0	72,283
Proceeds from issuance of PPP loan	0	682
Proceeds from initial public offering, net of issuance costs	0	(120)
Payment of initial public offering costs	(1,911)	0
Proceeds from issuance of common stock	75,001	0
Proceeds from exercise of stock options	140	0
Proceeds from issuance of common stock under Employee Stock Purchase Plan	190	0
Net cash provided by financing activities	73,420	75,576
Net increase in cash and cash equivalents	31,320	53,053
Cash and cash equivalents, beginning of period	238,605	3,704
Cash and cash equivalents, end of period	269,925	56,757
Supplemental disclosure of non-cash investing and financing activities
Property and equipment additions included in accounts payable and accrued expenses	8	0
Assumption of profits interest liability by affiliates	0	991
Equity issuance costs included in accounts payable and accrued expenses	3,947	5,082
Carrying value of convertible promissory notes settled in connection with Corporate Reorganization	0	27,711
Fair value of consideration issued in connection with settlement of convertible promissory notes	$ 0	$ 30,594