Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (34,770)	$ (25,504)
Adjustments to reconcile net loss to net cash used in operating activities
Stock-based compensation	2,646	2,292
Impairment charge on investment in equity securities	0	1,710
Depreciation	16	17
Loss on disposal of assets	0	7
Changes in operating assets and liabilities:
Prepaid materials	(983)	(611)
Prepaid expenses and other current assets	37	997
Other assets	4	331
Accounts payable	3,614	(127)
Accrued expenses	388	(54)
Payroll liabilities	(304)	208
Other current liabilities	(410)	(296)
Net cash used in operating activities	(29,762)	(21,030)
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of property and equipment	(23)	(19)
Net cash used in investing activities	(23)	(19)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from exercise of warrants	0	3,673
Net cash provided by financing activities	0	3,673
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(29,785)	(17,376)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING BALANCE	71,194	88,570
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, ENDING BALANCE	41,409	71,194
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH
Cash and cash equivalents	41,299	71,084
Restricted cash	110	110
Total cash, cash equivalents and restricted cash	41,409	71,194
Noncash Investing and Financing Items [Abstract]
Common stock issued upon cashless exercise of stock options	0	273
Conversion of Series B convertible preferred stock to common stock	$ 5	$ 0