Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities:
Net loss	$ (16,055)	$ (6,566)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	63	55
Net amortization of premiums and discounts on investments	0	(155)
Stock-based compensation expense	476	691
Loss on disposition of property and equipment	0	16
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(295)	345
Other assets	1,484	24
Accounts payable	(408)	(1,584)
Operating lease liabilities	(48)	(33)
Accrued expenses and other current liabilities	1,007	(570)
Other long-term liabilities	116	0
Net cash used in operating activities	(13,660)	(7,777)
Cash flows from investing activities:
Proceeds from sales or maturities of investments	0	15,750
Net cash provided by investing activities	0	15,750
Cash flows from financing activities:
Issuance of common stock	10,937	0
Issuance of common stock in connection with stock option exercises	101	0
Issuance of warrants	7,225	0
Net cash provided by financing activities	18,263	0
Effect of exchange rate changes on cash and cash equivalents	1	0
Net increase in cash, cash equivalents and restricted cash	4,604	7,973
Cash, cash equivalents and restricted cash at beginning of period	17,338	5,219
Cash, cash equivalents and restricted cash at end of period	21,942	13,192
Cash and cash equivalents at end of period	21,917	13,167
Restricted cash at end of period	25	25
Cash, cash equivalents and restricted cash at end of period	21,942	13,192
Supplemental disclosure of non-cash investing and financing activities:
Conversion of Series X non-voting convertible preferred stock into common stock shares	$ 46,405	$ 0