Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Operating activities
Net loss	$ (16,921)	$ (12,263)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	1,045	293
Depreciation and amortization of property and equipment	814	812
Asset impairment	91	0
Non-cash operating lease expense	176	160
Amortization of finance lease right-of-use assets	11	6
Amortization and accretion of premiums/discounts on held-to-maturity investments	(446)	0
Intellectual property contingent value rights liability	329	0
Changes in assets and liabilities:
Prepaid expenses and other current assets	(1,417)	(780)
Other assets	21	0
Accounts payable	135	825
Accrued expenses and other current liabilities	(4,879)	(2,444)
Operating lease liabilities	(609)	(164)
Net cash used in operating activities	(21,650)	(13,555)
Investing activities
Purchases of property and equipment	(65)	(29)
Proceeds from maturities of held-to-maturity investments	30,000	0
Net cash provided by (used in) investing activities	29,935	(29)
Financing activities
Offering costs in connection with pre-closing financing	(4,287)	0
Transaction costs related to reverse merger	(2,855)	0
Proceeds from the issuance of common stock upon exercise of options	629	112
Principal payments on finance leases	(11)	(5)
Net cash (used in) provided by financing activities	(6,524)	107
Net increase (decrease) in cash, cash equivalents and restricted cash	1,761	(13,477)
Cash, cash equivalents and restricted cash at beginning of period	148,718	82,021
Cash, cash equivalents and restricted cash at end of period	150,479	68,544
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	141	0
Supplemental cash flow information:
Cash paid for interest	$ 3	$ 2