CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Cash flows from operating activities:
Net loss	$ (4,579)	$ (4,929)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	103	115
Stock-based compensation	228	246
Operating lease	87	(5)
Bad debt expense	6	2
Accretion of interest on held-to-maturity investments	(6)	0
Gain on sale of property and equipment	0	(28)
Changes in operating assets and liabilities:
Accounts receivable	(125)	(121)
Prepaid expenses and other current assets	64	28
Inventory	27	(85)
Other assets	22	(36)
Accounts payable	22	(22)
Accrued expenses	55	26
Deferred revenue	10	(6)
Net cash used in operating activities	(4,086)	(4,815)
Cash flows from investing activities:
Purchase of held-to-maturity investments	(2,964)	0
Purchase of property and equipment	(125)	(69)
Proceeds received from sale of property and equipment	0	28
Net cash used in investing activities	(3,089)	(41)
Cash flows from financing activities:
Proceeds from the exercise of warrants, net	10,482	1,983
Proceeds from issuances of common stock, net	2,706	0
Proceeds from issuance of notes payable	0	25
Repayments of notes payable	(42)	(29)
Net cash provided by financing activities	13,146	1,979
Increase (decrease) in cash and cash equivalents	5,971	(2,877)
Cash and cash equivalents, beginning of period	1,307	5,395
Cash and cash equivalents, end of period	7,278	2,518
Supplemental cash flow information is as follows:
Interest paid	17	15
Income taxes paid	0	0
Non-cash investing and financing activities:
Operating lease entered into for right-to-use asset	2,439	0
Note payable incurred for the purchase of certain equipment	$ 0	$ 38