Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities
Net loss	$ (17,623)	$ (17,412)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	196	687
Amortization of debt issuance costs and debt discount	83	86
Stock-based compensation	127	1,015
Noncash interest expense and other charges	1,795	1,564
Change in right of use asset	93	133
Provision for excess and obsolete inventories	272	125
Gain on extinguishment of debt	0	(2,353)
Other non-cash charges	69	2
Changes in operating assets and liabilities:
Accounts receivable	269	89
Inventories	(1,387)	(849)
Prepaid expenses and other current assets	(62)	50
Other assets	15	(43)
Accounts payable	(764)	679
Accrued compensation	(208)	(94)
Accrued expenses and other current liabilities	(61)	49
Other long-term liabilities	426	575
Net cash used in operating activities	(16,760)	(15,697)
Cash flows from investing activities
Purchase of property and equipment	(51)	(34)
Net cash used in investing activities	(51)	(34)
Cash flows from financing activities
Net cash provided by financing activities	11,917	13,043
Net change in cash and cash equivalents	(4,894)	(2,688)
Cash and cash equivalents, beginning of period	19,497	22,185
Cash and cash equivalents, end of period	14,603	19,497
Noncash investing and financing activities:
Accretion of Series A preferred stock dividends	4,510	4,175
Issuance of Series A preferred stock as dividend payment	4,510	4,175
Transfers between inventory and property and equipment	751	(1)
Purchases of property and equipment in accounts payable	0	21
Common Stock [Member]
Cash flows from financing activities
Proceeds from the issuance of convertible preferred stock, net of commissions and issuance costs	6,721	0
Preferred Stock [Member]
Cash flows from financing activities
Proceeds from the issuance of convertible preferred stock, net of commissions and issuance costs	$ 5,196	$ 13,043