Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net loss	$ (21,902)	$ (8,393)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	63	67
Net amortization of premiums and discounts on investments	0	(156)
Stock-based compensation expense	984	920
Gain on sale of property and equipment	0	(42)
Loss on disposition of property and equipment	0	16
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(89)	(93)
Other assets	2,191	24
Accounts payable	(111)	(1,236)
Operating lease liabilities	(48)	(33)
Accrued expenses and other current liabilities	1,433	(491)
Net cash used in operating activities	(17,479)	(9,417)
Cash flows from investing activities:
Proceeds from sale of property and equipment	0	42
Proceeds from sales or maturities of investments	0	16,250
Net cash provided by investing activities	0	16,292
Cash flows from financing activities:
Proceeds from issuance of common stock, net of offering costs	10,645	0
Proceeds from issuance of common stock in connection with stock option exercises	142	0
Proceeds from issuance of warrants, net of offering costs	7,030	0
Net cash provided by financing activities	17,817	0
Effect of exchange rate changes on cash and cash equivalents	1	0
Net increase in cash, cash equivalents and restricted cash	339	6,875
Cash, cash equivalents and restricted cash at beginning of period	17,338	5,219
Cash, cash equivalents and restricted cash at end of period	17,677	12,094
Cash and cash equivalents at end of period	17,652	12,069
Restricted cash at end of period	25	25
Cash, cash equivalents and restricted cash at end of period	17,677	12,094
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