CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net loss	$ (1,136)	$ (1,219)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	0	86
Bad debt (recovery) expense	0	(24)
Non-cash lease expense from right-of-use asset	17	43
Stock-based compensation	31	31
Changes in operating assets and liabilities:
Accounts receivable	409	47
Inventory	112	89
Prepaid expenses and other current assets	(178)	(298)
Other assets	0	9
Accounts payable	140	23
Accrued expenses and other current liabilities	31	591
Deferred revenue	(39)	(125)
Lease liabilities	(17)	(97)
Net cash used in operating activities	(630)	(844)
Cash flows from financing activities:
Proceeds from private placement, net of issuance costs and amounts in escrow	0	1,473
Net cash provided by financing activities	0	1,473
Decrease (increase) in cash	(630)	629
Cash and cash equivalents at beginning of period	5,990	3,085
Cash and cash equivalents at end of period	5,360	3,714
Reconciliation of cash and cash equivalents
Cash	4,860	3,714
Current certificates of deposit	500	0
Total cash and cash equivalents	5,360	3,714
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	5	2
Cash paid for income taxes	0	31
Non-cash investing and financing activities:
Preferred stock dividends	44	0
Warrant modification	$ 0	$ 25