Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss		$ (62,481)	$ (96,631)
Adjustments to reconcile net loss to cash flows from operating activities:
Depreciation	$ 900	1,745	1,175
Share-based compensation expense		3,389	5,894
Amortization of discount on marketable securities		(2,369)
Changes in assets and liabilities:
Receivable from Former Parent		4,543
Prepaid expenses		(6,572)	688
Other current assets		159	(985)
Right-of-use assets		2,621	4,364
Other assets		(61)
Accounts payable and accrued expenses		(3,742)	(12,581)
Operating lease liabilities		(3,929)	(2,927)
Other long-term liabilities			(50)
Cash flows used in operating activities		(66,697)	(101,053)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities		(143,802)
Sales and maturities of marketable securities		63,000
Additions of property and equipment		(55)	(1,108)
Cash flows used in investing activities		(80,857)	(1,108)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net transfers from Former parent			102,161
Cash flows provided by financing activities			102,161
Net decrease in cash, cash equivalents and restricted cash		(147,554)
Cash, cash equivalents and restricted cash-beginning of period		271,110
Cash, cash equivalents and restricted cash-end of period	123,556	123,556
Non-cash investing and financing activities:
Purchased capital expenditures included in accounts payable and accrued expenses			$ 422
Reconciliation Of Balance Sheet To Statement Of Cash Flows Abstract
Cash and cash equivalents	121,587	121,587		$ 270,852
Restricted cash	1,969	1,969		300
Total cash, cash equivalents and restricted cash as shown in the statement of cash flows	$ 123,556	$ 123,556		$ 271,110