Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		44 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022
OPERATING ACTIVITIES:
Net loss			$ (189,033)	$ (245,197)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	$ 4,000	$ 2,800	11,430	7,735
Stock-based compensation expense			27,746	15,049
Change in the estimated fair value of contingent consideration			(12,613)	10,080	$ 89,900
Change in the estimated fair value of success payment liabilities			(66,815)	57,698	33,300
Non-cash expense for operating lease right-of-use assets			8,859	4,597
Other non-cash items, net			(6,687)	(2,255)
Changes in operating assets and liabilities:
Prepaid expenses and other assets			569	(2,985)
Operating lease right-of-use assets and liabilities			1,584	5,028
Accounts payable			2,144	1,397
Accrued expenses and other liabilities			8,833	7,898
Net cash used in operating activities			(213,983)	(140,955)
INVESTING ACTIVITIES:
Purchases of marketable securities			(63,583)	(414,437)
Proceeds from maturities of marketable securities			201,991	266,960
Purchases of property and equipment			(16,274)	(24,660)
Net cash provided by (used in) investing activities			122,134	(172,137)
FINANCING ACTIVITIES:
Proceeds from initial public offering, net of issuance costs				626,405
Proceeds from employee stock purchase plan and exercise of stock options, net			3,128	2,227
Proceeds from at the market offering of common stock, net of issuance costs			724
Net cash provided by financing activities			3,852	628,632
Net (decrease) increase in cash, cash equivalents, and restricted cash			(87,997)	315,540
Cash, cash equivalents, and restricted cash at beginning of period			261,848	126,949
Cash, cash equivalents, and restricted cash at end of period	$ 173,851	$ 442,489	173,851	442,489	$ 173,851
SUPPLEMENTAL CASH FLOW INFORMATION:
Operating lease right-of-use assets obtained in exchange for lease obligations			21,073	26,257
Purchases of property and equipment included in accounts payable and accrued liabilities			2,409	3,231
Cash received for amounts related to tenant improvement allowances			2,014	$ 5,160
Remeasurement of operating lease right-of-use asset for lease modification			$ (12,801)