Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (30,917)	$ (46,467)
Adjustments to reconcile net loss to cash flows from operating activities:
Depreciation	846	530
Share-based compensation expense	2,199	2,753
Changes in assets and liabilities:
Receivable from Former Parent	3,653
Prepaid expenses	(5,089)	1,024
Other current assets	167	(582)
Right-of-use assets	1,329	3,066
Other assets	(77)
Accounts payable and accrued expenses	(7,926)	(14,664)
Operating lease liabilities	(1,523)	(1,460)
Other long-term liabilities		63
Cash flows used in operating activities	(37,338)	(55,737)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities	(124,485)
Additions of property and equipment	(55)	(398)
Cash flows used in investing activities	(124,540)	(398)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net transfers from Former parent		56,135
Cash flows provided by financing activities		56,135
Net decrease in cash, cash equivalents and restricted cash	(161,878)
Cash, cash equivalents and restricted cash-beginning of period	271,110
Cash, cash equivalents and restricted cash-end of period	109,232
Non-cash investing and financing activities:
Purchased capital expenditures included in accounts payable and accrued expenses		$ 75
Reconciliation Of Balance Sheet To Statement Of Cash Flows Abstract
Cash and cash equivalents	107,263		$ 270,852
Restricted cash	1,969		300
Total cash, cash equivalents and restricted cash as shown in the statement of cash flows	$ 109,232		$ 271,110