CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net loss	$ (12,669)	$ (13,266)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	0	113
Non-cash lease cost	254	236
Share-based compensation	2,023	2,170
Changes in operating assets and liabilities:
Collaboration receivable, current and non-current - related party	23,333	0
Other receivables	(3,472)	(781)
Prepaid expenses and other current assets	510	(164)
Other assets	1	0
Accounts payable	1,688	(34)
Accrued expenses and other current liabilities	(1,177)	(111)
Deferred revenue, current and non-current	(141)	(224)
Deferred revenue - related party, current and non-current	(4,064)	(516)
Other long-term liabilities	(49)	(11)
Operating lease liability	(299)	(265)
Net cash provided by (used in) operating activities	5,938	(12,853)
Cash flows from investing activities:
Net decrease in cash and cash equivalents:	5,938	(12,853)
Cash, cash equivalents and restricted cash at beginning of period	76,333	109,107
Cash, cash equivalents and restricted cash at end of period	$ 82,271	$ 96,254