Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Cash flows from operating activities:
Net loss	$ (5,501)	$ (7,113)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization expense	0	59
Stock-based compensation expense	264	150
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(125)	185
Other assets	(764)	1,301
Accounts payable	238	966
Operating lease liabilities	0	(48)
Accrued expenses and other current liabilities	(10)	(771)
Other long-term liabilities	(277)
Net cash used in operating activities	(6,175)	(5,271)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of offering costs	737	0
Proceeds from issuance of common stock in connection with stock option exercises	1	0
Net cash provided by financing activities	738	0
Net decrease in cash, cash equivalents and restricted cash	(5,437)	(5,271)
Cash, cash equivalents and restricted cash at beginning of period	12,865	17,338
Cash, cash equivalents and restricted cash at end of period	7,428	12,067
Cash and cash equivalents at end of period	7,428	12,042
Restricted cash at end of period	0	25
Cash, cash equivalents and restricted cash at end of period	7,428	12,067
Supplemental disclosure of non-cash investing and financing activities:
Conversion of Series X non-voting convertible preferred stock into common stock shares	$ 0	$ 44,826