CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net loss	$ (2,037)	$ (2,332)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	36	66
Stock-based compensation	166	224
Bad debt expense	(2)	0
Changes in operating assets and liabilities:
Accounts receivable	69	21
Other assets	(1)	0
Prepaid expenses	28	(29)
Inventory	38	54
Accounts payable	(325)	(89)
Accrued expenses	24	56
Deferred revenue	(11)	0
Net cash used in operating activities	(2,015)	(2,029)
Cash flows from investing activities:
Purchase of property and equipment	(1)	(66)
Net cash used in investing activities	(1)	(66)
Cash flows from financing activities:
Repayments of notes payable	0	(3)
Repayments of finance lease obligations	0	(13)
Payment of employee withholding taxes related to share based awards	(11)	0
Net cash used in financing activities	(11)	(16)
Decrease in cash and cash equivalents	(2,027)	(2,111)
Cash and cash equivalents, beginning of period	4,775	9,326
Cash and cash equivalents, end of period	2,748	7,215
Supplemental disclosures of cash flow information:
Interest paid	0	1
Income taxes paid	$ 0	$ 0