Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Cash flows from operating activities:
Net loss	$ (2,662)	$ (1,140)	$ (7,969)	$ (5,255)
Adjustments to reconcile net loss to net cash used in operating activities:
Other income	0	(862)	(30)	(862)
Gain on forgiveness of Paycheck Protection Program loan	0	0	0	(801)
Depreciation	42	43	129	143
Stock-based compensation	17	39	115	387
Provision for doubtful accounts receivable	1	2	(3)	10
Provision for slow-moving and obsolete inventories	220	(70)	164	(9)
Provision for warranties	(74)	1	(53)	13
Amortization of loan discounts and origination fees	87	61	247	158
Loss on write-off of property and equipment	76	0	76	0
Changes in operating assets and liabilities (sources / (uses) of cash):
Accounts receivable	139	(500)	240	390
Inventories	792	444	1,546	(2,105)
Short-term deposits	(110)	(62)	(51)	87
Prepaid and other assets	46	(91)	162	(119)
Accounts payable	629	(164)	(92)	(82)
Accrued and other liabilities	(101)	53	(461)	(305)
Deferred revenue	7	(69)	(261)	(70)
Total adjustments	1,771	(1,175)	1,728	(3,165)
Net cash used in operating activities	(891)	(2,315)	(6,241)	(8,420)
Cash flows from investing activities:
Acquisitions of property and equipment	(9)	(100)	(41)	(311)
Net cash used in investing activities	(9)	(100)	(41)	(311)
Cash flows from financing activities (sources / (uses) of cash):
Proceeds from the issuance of common stock and warrants	0	0	3,500	5,000
Proceeds from the exercise of warrants	0	0	0	527
Offering costs paid on the issuance of common stock and warrants	0	(1)	(334)	(470)
Principal payments under finance lease obligations	0	(1)	(1)	(3)
Proceeds from exercise of stock options and employee stock purchase plan purchases	0	0	5	59
Common stock withheld in lieu of income tax withholding on vesting of restricted stock units	0	1	0	(1)
Proceeds from the related party promissory note payable	450	0	450	0
Deferred financing costs paid	(95)	0	(329)	(30)
Net payments on the credit line borrowings - Credit Facilities	58	1,128	(215)	337
Net cash provided by financing activities	3	1,127	3,641	6,934
Net decrease in cash	(897)	(1,288)	(2,641)	(1,797)
Cash, beginning of period	938	1,669	2,682	2,178
Cash, end of period	41	381	41	381
2021 Streeterville Note
Cash flows from financing activities (sources / (uses) of cash):
Proceeds from the related party promissory note payable	0	0	0	1,515
Payments on the 2021 Streeterville note	(410)	0	(1,435)	0
2022 Streeterville Note
Cash flows from financing activities (sources / (uses) of cash):
Proceeds from the related party promissory note payable	$ 0	$ 0	$ 2,000	$ 0