CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net loss	$ (4,030)	$ (4,901)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	69	113
Stock-based compensation	336	430
Bad debt expense	(2)	12
Changes in operating assets and liabilities:
Accounts receivable	71	(19)
Other assets	(2)	0
Prepaid expenses	92	(108)
Inventory	88	25
Accounts payable	(420)	(47)
Accrued expenses	61	306
Deferred revenue	(20)	41
Net cash used in operating activities	(3,757)	(4,148)
Cash flows from investing activities:
Purchase of property and equipment	(21)	(146)
Net cash used in investing activities	(21)	(146)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net	1,210	0
Repayments of notes payable	0	(5)
Repayments of finance lease obligations	0	(27)
Payment of employee withholding taxes related to share based awards	(11)	0
Net cash provided by (used in) financing activities	1,199	(32)
Decrease in cash and cash equivalents	(2,579)	(4,326)
Cash and cash equivalents, beginning of period	4,775	9,326
Cash and cash equivalents, end of period	2,196	5,000
Supplemental disclosures of cash flow information:
Interest paid	0	1
Income taxes paid	$ 0	$ 0