CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net loss	$ (4,929)	$ (5,977)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	115	104
Stock-based compensation	246	467
Bad debt expense	2	(4)
Gain on sale of property and equipment	(28)	0
Changes in operating assets and liabilities:
Accounts receivable	(121)	34
Prepaid expenses and other current assets	28	(7)
Inventory	(85)	150
Other assets	(41)	(3)
Accounts payable	(22)	(393)
Accrued expenses	26	111
Deferred revenue	(6)	(29)
Net cash used in operating activities	(4,815)	(5,547)
Cash flows from investing activities:
Purchase of property and equipment	(69)	(114)
Proceeds received from sale of property and equipment	28	0
Net cash used in investing activities	(41)	(114)
Cash flows from financing activities:
Proceeds from the exercise of warrants, net	1,983	0
Proceeds from issuances of common stock, net	0	2,998
Proceeds from issuance of notes payable	25	44
Repayments of notes payable	(29)	0
Payment of employee withholding taxes related to share based awards	0	(11)
Net cash provided by financing activities	1,979	3,031
Decrease in cash and cash equivalents	(2,877)	(2,630)
Cash and cash equivalents, beginning of period	5,395	4,775
Cash and cash equivalents, end of period	2,518	2,145
Supplemental cash flow information is as follows:
Interest paid	15	0
Income taxes paid	0	0
Non-cash investing and financing activities:
Note payable incurred for the purchase of certain equipment	$ 38	$ 10