Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Operating activities
Net loss	$ (35,413)	$ (24,123)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	3,359	677
Depreciation and amortization of property and equipment	1,615	1,627
Asset impairment	91	0
Non-cash operating lease expense	360	324
Amortization of finance lease right-of-use assets	27	14
Amortization and accretion of premiums/discounts on held-to-maturity investments	(772)	0
Contingent value rights liability	818	0
Changes in assets and liabilities:
Prepaid expenses and other current assets	(2,053)	(634)
Other assets	(30)	0
Accounts payable	368	852
Accrued expenses and other liabilities	(4,672)	(1,288)
Operating lease liabilities	(1,241)	(331)
Net cash used in operating activities	(37,543)	(22,882)
Investing activities
Purchases of property and equipment	(525)	(111)
Purchases of held-to-maturity investments	(42,654)	0
Proceeds from maturities of held-to-maturity investments	49,500	0
Net cash provided by (used in) investing activities	6,321	(111)
Financing activities
Offering costs in connection with pre-closing financing	(4,287)	(100)
Transaction costs related to reverse merger	(2,855)	0
Proceeds from the issuance of common stock upon exercise of options	1,044	132
Principal payments on finance leases	(27)	(11)
Net cash (used in) provided by financing activities	(6,125)	21
Net decrease in cash, cash equivalents and restricted cash	(37,347)	(22,972)
Cash, cash equivalents and restricted cash at beginning of period	148,718	82,021
Cash, cash equivalents and restricted cash at end of period	111,371	59,049
Supplemental disclosure of non-cash investing and financing activities:
Additions to operating lease right of use assets from new operating lease liabilities	60	0
Property and equipment included in accounts payable and accrued expenses	71	52
Additions to finance lease right of use assets from new finance lease liabilities	25	46
Deferred offering cost	0	523
Supplemental cash flow information:
Cash paid for interest	$ 7	$ 5