Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities
Net loss	$ (2,116)	$ (2,240)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock based compensation	84	61
Depreciation	2	2
Amortization of right-of-use asset	42	40
Accounts receivable allowances		5
Changes is operating assets and liabilities:
Accounts receivable	31	(30)
Inventory	(80)	(18)
Prepaid expenses and other current assets	(59)	175
Accounts payable	(229)	(163)
Accrued expenses	(76)	36
Lease liabilities	(25)	(36)
Net cash used in operating activities	(2,426)	(2,168)
Cash flows from investing activities
Acquisition of property and equipment	(94)	(6)
Net cash used in investing activities	(94)	(6)
Cash flows from financing activities
Proceeds from issuance of common stock, net of issuance costs	4,191
Offering costs in advance of sale of common stock	(21)
Net cash provided by financing activities	4,170
Net increase (decrease) in cash and cash equivalents	1,650	(2,174)
Cash and cash equivalents
Beginning of period	3,517	12,975
End of period	5,167	$ 10,801
Supplemental disclosure on noncash financing activities
Issuance of common stock warrant	195
Deferred offering costs charged to additional paid-in-capital	$ 584