Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		38 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022
OPERATING ACTIVITIES:
Net loss	$ (31,448)	$ (180,617)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	3,614	2,247
Stock-based compensation expense	7,755	4,158
Change in the estimated fair value of contingent consideration	(528)	11,393	$ 102,000
Change in the estimated fair value of success payment liabilities	(54,910)	115,657	45,200
Non-cash expense for operating lease right-of-use assets	2,606	1,398
Other non-cash items, net	(1,437)	(1,013)
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(3,191)	(1,614)
Operating lease right-of-use assets and liabilities	372
Accounts payable	1,917	1,599
Accrued expenses and other liabilities	(2,459)	(3,121)
Net cash used in operating activities	(77,709)	(49,913)
INVESTING ACTIVITIES:
Purchases of marketable securities	(25,675)	(44,811)
Proceeds from maturities of marketable securities	45,753	100,342
Purchases of property and equipment	(7,533)	(6,440)
Net cash provided by investing activities	12,545	49,091
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	652	298
Net cash provided by financing activities	652	626,703
Net increase (decrease) in cash, cash equivalents, and restricted cash	(64,512)	625,881
Cash, cash equivalents, and restricted cash at beginning of period	261,848	126,949
Cash, cash equivalents, and restricted cash at end of period	197,336	752,830	$ 197,336
SUPPLEMENTAL CASH FLOW INFORMATION:
Operating lease right-of-use assets obtained in exchange for lease obligations	3,431
Purchases of property and equipment included in accounts payable and accrued liabilities	3,425	$ 3,157
Cash received for amounts related to tenant improvement allowances	$ 541