STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net loss	$ (9,695)	$ (8,268)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	183	303
Stock-based compensation	711	765
Paycheck Protection Program loan forgiveness	0	(646)
Loss on sale of equipment	28	0
Bad debt expense	6	0
Changes in operating assets and liabilities:
Accounts receivable	(42)	(52)
Other assets	0	12
Prepaid expenses	(148)	(52)
Inventory	148	(56)
Accounts payable	206	(71)
Accrued expenses	(18)	286
Deferred revenue	44	0
Net cash used in operating activities	(8,577)	(7,779)
Cash flows from investing activities:
Proceeds received on sale of property and equipment	4	1
Purchase of property and equipment	(174)	(100)
Net cash used in investing activities	(170)	(99)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net	4,228	12,421
Repayments of notes payable	(5)	(39)
Repayments of finance lease obligations	(27)	(54)
Proceeds from the exercise of warrants	0	1,250
Payment of employee withholding taxes related to share based awards	0	(17)
Net cash provided by financing activities	4,196	13,561
Increase (decrease) in cash and cash equivalents	(4,551)	5,683
Cash and cash equivalents, beginning of year	9,326	3,643
Cash and cash equivalents, end of year	4,775	9,326
Cash paid for:
Interest paid	1	11
Income taxes paid	$ 0	$ 0