Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Cash flows from operating activities:
Net loss	$ (1,333)	$ (2,821)	$ (10,300)
Adjustments to reconcile net loss to net cash used in operating activities:
Other income	0	(30)
Depreciation	8	44
Stock-based compensation	26	44
Provision for doubtful accounts receivable	29	(9)
Provision for slow-moving and obsolete inventories	(23)	129
Provision for warranties	(40)	(30)
Amortization of loan discounts and origination fees	62	69
Changes in operating assets and liabilities (sources / (uses) of cash):
Accounts receivable	(496)	(83)
Inventories	562	370
Short-term deposits	(23)	12
Prepaid and other assets	6	20
Accounts payable	(27)	61
Accrued and other liabilities	66	(211)
Deferred revenue	0	(268)
Total adjustments	150	118
Net cash used in operating activities	(1,183)	(2,703)	(6,700)
Cash flows from investing activities:
Acquisitions of property and equipment	0	(35)
Net cash used in investing activities	0	(35)
Cash flows from financing activities (sources / (uses) of cash):
Proceeds from the issuance of common stock and warrants	3,025	0
Principal payments under finance lease obligations	0	(1)
Net payments on proceeds from the credit line borrowings - Credit Facilities	(1,093)	897
Net cash provided by financing activities	1,432	281
Net increase (decrease) in cash	249	(2,457)
Cash beginning of period	52	2,682	2,682
Cash end of period	301	225	$ 52
2022 Streeterville Note
Cash flows from financing activities (sources / (uses) of cash):
Repayments of notes payable	(500)	0
2021 Streeterville Note
Cash flows from financing activities (sources / (uses) of cash):
Repayments of notes payable	$ 0	$ (615)