Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Cash Flows from Operating Activities
Net loss			$ (110,482)	$ (31,709)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense			2,243	248
Amortization of finance lease right-of-use asset				22
Amortization of intangible assets	$ 423	$ 0	1,265	0
Non-cash operating lease expense			4,134	212
Stock-based compensation expense	3,287	315	9,360	714
Change in fair value of redeemable convertible preferred stock tranche liability		8,364		9,533
Change in fair value of contingent consideration and contingent value rights liabilities	167		21,563
Accretion of discounts and amortization of premiums on marketable securities			63
Deferred income tax			(1,204)
Gain on sale of assets to equity method investment			(7,227)
Share of net loss of equity method investment	84		84
Changes in operating assets and liabilities:
Accounts receivable			250
Prepaid expenses and other assets			2,153	(233)
Accounts payable			1,822	2,321
Accrued and other liabilities			(1,968)	4,524
Operating lease liabilities			(2,204)	(182)
Deferred revenue			(95)
Net cash used in operating activities			(80,243)	(14,550)
Cash Flows from Investing Activities
Purchases of marketable securities			(128,984)	(522)
Proceeds from marketable securities			95,315
Purchases of property and equipment			(1,497)
Proceeds from sale of property and equipment			267
Net cash used in investing activities			(34,899)	(522)
Cash Flows from Financing Activities
Proceeds from issuance of common stock, net of offering costs				1
Proceeds from exercise of stock options and warrants			2,027
Proceeds from at-the-market sales agreement, net of offering costs			33,891
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs				14,479
Repayment of finance lease liability-related party				(31)
Net cash provided by financing activities			35,918	14,449
Effect of exchange rate changes on cash, cash equivalents and restricted cash			320	(67)
Net increase (decrease) in cash, cash equivalents and restricted cash			(78,904)	(690)
Cash, cash equivalents and restricted cash at beginning of period			189,500	11,357
Cash, cash equivalents and restricted cash at end of period	110,596	10,667	110,596	10,667
Supplemental Disclosure of Non-Cash Investing and Financing Activities
Purchases of property and equipment included in accounts payable and in accrued and other current liabilities			116	19
Right-of-use asset for office space acquired through leases			5,406	1,449
Reduction of the tranche liability accounted for as a deemed contribution by preferred stockholders				9,723
Reconciliation of Cash, Cash Equivalents and Restricted Cash
Cash and cash equivalents	108,522	10,667	108,522	10,667
Restricted cash	2,074		2,074
Cash, cash equivalents and restricted cash at end of period	$ 110,596	$ 10,667	$ 110,596	$ 10,667